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INTRODUCTION
UDO has been designed specifically to provide compliant and secure
archival storage for valuable business information such as high
volume emails and document images, customer records, audio or video
files, legal or financial information and design documentation. UDO
continues to deliver all the strengths of optical storage such as
data authenticity and longevity, but with much higher capacity and
greatly reduced costs.
UDO is available in Rewritable and Write Once (True Write Once and
Compliant Write Once) media formats. The use of Write Once media is
often called for by data storage regulations because it provides an
unalterable, non-erasable format that facilitates clear data audit
trails and the establishment of record authenticity.
UDO Rewritable media is typically used in archive environments
where data needs to be deleted or media capacity re-used.
UDO customers include investment banks, on-line trading companies,
multinational insurance companies, government institutions,
healthcare delivery organizations, television and radio
broadcasters, retail companies and engineering firms.
2.What is an Ultra density optical disc?
Ultra Density Optical technology, commonly referred to as UDO, is
the ideal successor to Magneto Optical (MO) archival storage
because it adheres to the 5.25" ISO standard form factor. UDO
offers customers more than three times the capacity of MO, with 33%
faster file access, 8 MB/sec read transfer rates and a lower longer
term cost of ownership; roughly 84% per GB less than MO. UDO will
deliver the highest level of data integrity and trustworthiness
with phase change write once recording and is considered the new 30
GB standard for professional optical storage; ideal for customers
who must meet international, commercial and governmental archival
regulations.
Phase Change Technology utilizes the heat from a blue laser to
write data on the recording surface of optical media. The laser
records data marks by altering the reflective quality of the
recording surface. This is done by changing the physical state of
the media's recording layer from a crystalline to an amorphous
state, which produces bright to dark marks on the media.
The laser, set at a lower intensity, is then used to read the
media. UDO Write Once optical technology prevents data from being
overwritten or altered. UDO uses a non-contact recording to provide
robust and reliable performance and is insensitive to exposure to
magnetic fields.
.
3.DIFFERENT FORMATS
UDO is available in Rewritable and Write Once (True Write Once and
Compliant Write Once) media formats. The use of Write Once media is
often called for by data storage regulations because it provides an
unalterable, non-erasable format that facilitates clear data audit
trails and the establishment of record authenticity. UDO Rewritable
media is typically used in archive environments where data needs to
be deleted or media capacity re-used.
3.1 Rewritable Media
UDO Rewritable media uses a specially formulated Phase Change
recording surface that allows recorded data to be deleted and
modified. In practice, UDO Rewritable media operates like a
standard magnetic disk. Files can be written, erased and rewritten,
dynamically reallocating media capacity. Rewritable UDO media is
typically used in archive applications where the stability and
longevity of optical media is important, but the archive records
change on a relatively
frequent or discretionary basis.
In these environments the archive may be more transient and used
to off-load static data from the primary disk storage with the
added benefit of being able to reuse the media capacity in the
future. UDO Rewritable media is ideal for small office and
departmental applications or in larger unstructured archives that
are not subject to specific regulatory or corporate standards.
3.2 True Write Once Media
UDO True Write once media uses a totally different Phase Change
recording surface than the Rewritable media. Unlike Rewritable
media, the Write Once recording surface cannot be erased or
altered, giving True Write Once media the highest possible level of
physical record authenticity. This level of data integrity cannot
be matched by magnetic disk or tape technologies using Write Once
emulation. True Write Once optical media has a very long and
successful history with a wide range of applications across many
industries.
Its greatest strengths are media longevity to reduce the cost and
frequency of migration, and data authenticity that meets strict
legal standards. Common uses of True Write Once media include
medical, financial, industrial and cultural applications that have
long or indefinite record retention periods with a need for
unquestioned record authenticity.
3.3 Compliant Write Once Media
UDO Compliant Write once media has the same operational properties
as True Write Once media with one important difference. Through the
use of a specially designed shred operation, individual records
written to Compliant Write Once media can be destroyed once their
retention period expires.
The shred function is controlled at an application level and
operates only on Compliant Write Once media. It is a fully verified
process and unlike the erase pass on magnetic disks, the shred
operation on Phase Change media leaves no residual traces of
previously written data. While it is possible to shred data on
magnetic disks through the use of specialized tools that repeatedly
overwrite a patterned sequence, destroying individual records on
magnetic tape is not possible without totally rewriting the media.
Shredding data on Compliant Write Once media is highly efficient
and provides the highest possible standard for absolute data
destruction.
The driving requirement behind the use of Compliant Write Once is
risk management and compliance. Industry regulations and corporate
policies often mandate specific record retention periods for
archive data. Some regulations require that records be physically
destroyed when the retention period expires and in other instances
the destruction of the data is at the discretion of the
organization or by customer request. In all cases, the use of UDO
Compliant media provides Write Once data authenticity while
ensuring total data destruction.
The proper disposition of records can dramatically reduce
political and financial liability as organizations seek to avoid
situations where legal discovery proceedings uncover record should
have been destroyed.
The attributes of Write Once authenticity and absolute data
destruction make UDO Compliant Write Once media ideal for ILM
(Information Lifecycle Management) environments, email archiving
applications and the controlled storage of regulated records.
3.3(a).Compliant Write Once Media Operational Overview
Physical Media Identification
UDO Write Once Media is available in two different formats: True
Write Once and Compliant Write Once. Since both of these media
formats offer similar Write Once media attributes, they are housed
in the same blue Write Once antistatic media cartridge. While the
cartridge color is the same, the Compliant Write Once media has a
distinctive red text field printed on the shutter
At an operational level, the UDO drive identifies the three UDO
media types through the use of a SDI (Specific Disk Information)
field registered on the media header during the manufacturing
process. The SDI is present in a specific location on the media and
cannot be altered or modified. In addition to containing a unique
disk serial number, the name of the manufacturer and additional
drive and media information, it also includes a code that
identifies the media as Rewritable, True Write Once or Compliant
Write Once. A UDO drive can read and write data on all three media
types, but since the physical recording surfaces differ, the drive
needs to know which media is loaded so a drive calibration can be
performed for the appropriate media characteristics.
The SDI number is automatically read by the UDO drive when a piece
of media is loaded, and if identified as Compliant Write Once
media, the SDI authorizes the drive firmware to perform the shred
operation used to destroy data sectors
Media Sector Format Compliant
Write Once media uses the same 8KB sector size as the other two UDO
media types. Each 8KB sector is divided into three primary fields:
a VAP (Verify and Protect) field, the actual data field and a field
containing ECC (Error Correction Code) information. Figure
2provides a schematic diagram detailing the full structure of the
8KB sector. Structure of 8KB Media Sector The VAP field is created
when data is written to media sectors on True Write Once and
Compliant Write Once media. It is a standard identifier to verify
that the sector in question is a Write Once sector.
This field is present primarily for efficiency. The presence of
the VAP field tells the application that there is no need to
perform a Blank Check pass on the sector in question. The VAP
field is very small, using less than one tenth of one percent of
the 8KB sector. The data field contains the actual file data
written by the application or user and occupies about 90% of the
total sector size. This is followed by the ECC field, which makes
up the remaining 10% (approximately) of the sector. The ECC file
contains coded parity information about the data in the sector that
allows the drive to read the data field even if the media surface
is dirty or has been damaged.
Data Shred Command Operation and Application Control On Compliant
Write Once media, the data field within a media sector can be
destroyed by means of a unique data shred command executed through
the SCSI interface. the drive to quickly recognize the sector as
shredded. If all fields within the sector were destroyed, the drive
could confuse the sector(s) as unwritten or damaged causing
unnecessary reallocation operations that would degrade performance.
Data Shred Command Operation and Application Control
On Compliant Write Once media, the data field within a media sector
can be destroyed by means of a unique data shred command executed
through the SCSI interface. However, given the sensitive nature of
data destruction, shred operations are normally only initiated at
an application level where access and security can be closely
managed. When the shred command is executed against a specific
sector or range of sectors, only the data field within each 8KB
sector is destroyed. The VAP and ECC fields remain intact. These
fields are left in place to allow the drive to quickly recognize
the sector as shredded. If all fields within the sector were
destroyed, the drive could confuse the sector(s) as unwritten or
damaged causing unnecessary reallocation operations that would
degrade performance.
Data Destruction on 8KB Media Sector It is important to note that
while the associated ECC information for a destroyed data field is
left behind, it would be mathematically impossible to reconstruct
the entire data field from the remaining coded information.
Physical Destruction and Verification Process
UDO media employs a Phase Change recording process to read and
write data on the three different media types. A high-density blue
laser heats the recording surface changing the molecular structure
between crystalline and amorphous states depending on the function
being performed and the media type in question. With Rewritable
media data, sectors can be raised and rewritten. True Write Once
media only permits write and read operations since it s not
possible for the laser, regardless of the temperature, to alter the
data once it has been written.
Like True Write Once media, Compliant Write Once media does not
allow the deletion & rewriting of data, but has a special shred
command to destroy data fields. The shred command that operates on
Compliant Write Once media uses a specific laser intensity that
totally destroys the data files on targeted sectors. Data points
written using phase Change technology can exist in only one state
at a time (amorphous or crystalline) once destroyed the data cannot
be retrieved. When shredded, the physical and chemical ace Change
process begins at the perimeter of the data points and re-
crystallizes from the outside in. As a result, no residual traces
of data are left behind even when factoring in track deviation and
variance in laser intensity tolerances from one drive to another.
Destruction process on Compliant Write Once media is very different
than the erase pass n a magnetic disk. Magnetic disk erase
operations leave physical traces of recorded data hat can be
recovered using special procedures. To avoid data recovery on
magnetic disks, multi-pass erase and overwrite operation can be
employed, rewriting a specific pattern as any as ten times over the
same sector to ensure that data cannot be recovered. This operation
can be very time consuming if there are large numbers of documents
to be destroyed and if this technique is not used, the documents
may still be resent on the disk creating a potential liability risk
for business or other organizational processes.
UDO Compliant Write once media uses a secure two-pass shred
operation. The first pass is for the destruction of the data and
the second pass is to verify that the operation as successfully
completed.
Shredding of Reallocated Sectors
Sector reallocation on UDO media uses a very similar technique as
is employed with risks. If a defective media sector was identified
during a write operation it would be automatically reallocated from
the original sector to a secondary defect list. When a shred
operation is executed against a sector with reallocation, both the
original and reallocated sectors are shredded in order to ensure
that all data related to the targeted sector is physically
destroyed.
Verify and Scan Operations
Since Compliant Write Once media only allows data to be written
once to any given sector, the media capacity from shredded sectors
cannot be recaptured. Consequently, it is necessary for both the
drive and higher level applications to easily distinguish shredded
sectors from blank sectors when assessing sector availability and
overall media capacity.
When a sector is shredded it retains a status that is clearly
identifiable at an application level. If the application issues a
standard Verify for Written SCSI operation against a shredded
sector, the drive returns a shredded status to inform the host
that the sector is not blank. If the application issues a Verify
for Blank operation against a shredded sector, the drive returns a
Not Blank status so that inappropriate write operations cannot be
performed. Then trying to assess the available media capacity, a
Medium Scan operation can be executed. This command identifies
shredded sectors as written, allowing the proper available media
capacity to be determined.
3.3(b) Compliant Write Once Media Summery
In the past, organizations focused very little on the disposition
of aging data, but changes in technology, regulations and corporate
risk management have dramatically altered the archive landscape.
There is a growing imperative to better manage information assets
in line with business priorities. Sometimes referred to as ILM
(Information Lifecycle Management) /DLM (Data Lifecycle
Management), the intelligent and articulate control of data is
becoming essential to achieving fundamental business objectives.
The envelopment of Compliant Write Once media was a very direct
response to these evolving organizational and technical
requirements.
The functionality and physical attributes of the Compliant Write
Once technology provides a unique combination of media longevity,
record authenticity and assured data destruction that cannot be
matched by magnetic disks or taps. These technical capabilities
make compliant write once valuable tool in addressing industry
regulations and corporate policies. As part of a trio of UDO media
formats that also includes Rewritable and True Write Once,
Compliant Write Once media provides organizations with the
flexibility to match their business needs with the most appropriate
archival storage technology.
4. UDO Media Technical Overview
Write Once Media is available in two different formats: True Write
Once and Compliant Write Once. Since both of these media formats
offer similar Write Once media attributes, they are housed in the
same blue Write Once antistatic media cartridge. While the
cartridge color is the same, the Compliant Write Once media has a
distinctive red text field printed on the shutter. At an
operational level, the UDO drive identifies the three UDO media
types through the use of a SDI (Specific Disk Information) field
registered on the media header during the manufacturing process.
The SDI is present in a specific location on the media and cannot
be altered or modified.
In addition to containing a unique disk serial number, the name of
the manufacturer and additional drive and media information, it
also includes a code that identifies the media as Rewritable, True
Write Once or Compliant Write Once. A UDO drive can read and write
data on all three media types, but since the physical recording
surfaces differ, the drive needs to know which media is loaded so a
drive calibration can be performed for the appropriate media
characteristics.
The SDI number is automatically read by the UDO drive when a piece
of media is loaded, and if identified as Compliant Write Once
media, the SDI authorizes the drive firmware to perform the shred
operation used to destroy data sectors. The combination of a media
based SDI and drive based firmware controls provides a highly
secure architecture that ensures the proper and efficient operation
of all three media types.
Specifications of the "5.25 inch UDO Format"
5.25-inch UDO Format 5.25-inch MO
system (9.1GB)*under development
Rewritable Write-Once
Disk Diameter 130mm 130mm 130mm
DiskThickness 2.4mm 2.4mm 2.4mm
Cartridge Size Same as ISO 130mm (135 x 153 x 11 mm) Same as ISO
130mm (135 x 153 x 11 mm) ISO 130mm
(135 x 153 x 11 mm)
Number of physical tracks 96,964 96,964 49,728
Sector size 8KB 8KB 4KB
Number of sectors 2,504,407 2,504,407 1,118,880
Data area 29.0-61.0mm 29.0-61.0mm 29.7-62.5mm
Objective lens (NA) 0.85 0.85 0.575
Recording layer Phase change Phase change Magneto Optical
Recording format Land & Groove Land & Groove Land &
Groove
Recording side both sides both sides both sides
Track Pitch 0.33um 0.33um 0.65um
Minimum bit length 0.13um 0.13um 0.3um
Recording 15.0 Gb/inch2 15.0 Gb/inch2 3.3 Gb/inch2
Transfer rate 4-8MB/sec 4-8MB/sec 3-6MB/sec
Media Capacity 30GB (Double Sided)
Sector Size 8KB
Cartridge Size 5.25 inch
Recording Layer Phase Change
Media Life 50+ years
Rewrite Cycles 10,000 (Rewritable media)
Certification ISO/IEC 17345, ECMA-350
UDO Media Specifications Summary
5. How does UDO works ?
5.1 UDO Recording Technology
5.1(a). UDO PHASE CHANGE MEDIA DESIGN CRITERIA
toDisc stores digitally encoded video, audio and other data
information in pits-spiral grooves that run from the centre of the
disc to the end of the disc. A laser reads the other side of these
pits-the bumps-to play the movie or program that stored in DVD. The
more data that is containing on a disc, the smaller are more
closely packed the pits must be. The smaller pits the more precise
the reading laser must be unlike current DVDs, which use a red
laser to read and write data. UDO uses a blue laser which has
shorter wave length (405nm) than a red laser (650nm)
The primary market for UDO will be writing once applications. In
order to fulfill the increasing number of legislative requirements
to provide an unalterable audit trail, the need for true write once
media is becoming more and more important. Unlike MO media which is
inherently rewritable (with write once functionality being achieved
through software), phase change coatings can be designed to be
truly write once. However, because some applications require
rewritability, the UDO drives are multifunctional, and both UDO
write once and UDO rewritable media have been developed. The two
types of media have slightly different formats (minor differences
in the formatted information and groove geometry) but very
different phase change alloy coatings, each optimized according
their application: archival true write once or high scalability
rewritable. In the following sections, we shall discuss some of the
design considerations leading to the selection of the phase change
materials and stack development for each type of UDO media and
illustrate the resulting performance.
5.1(b). UDO REWRITABLE MEDIA
UDO rewritable is based on fast growth phase change, the active
layer being a Sb-Te-Ge alloy close to the Sb69Te31 eutectic
composition. UDO rewritable is a high density, fast recording media
combined with high scalability, and high resistance to cross erase.
Figures show typical results for the UDO power margin, overwrite
performance and cross erase, with in excess of 20,000 direct
overwrite cycles being achieved. Note that BERC is a measure of
byte error rate, with results less than 30 being acceptable to the
drive.
Figure: UDO Rewritable Write Power Margin plots of BERC (a measure
of BER within a sector, results below 30 are acceptable to the
drive) as a function of write power, for land and groove recording
at inner and outer diameter velocity
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6. UDO ADVANTAGES
¢ Record high definition television (HDTV) without any
quality loss.
¢ Instantly skip to any spot on the disc.
¢ Record one program while watching another on the disc with
out any disturbance.
¢ Automatically searches for an empty space on the disc to
avoid recording over a program.
¢ Complies with industry regulations for record authenticity
¢ Provides unmatched media longevity
¢ Supports scalable, high capacity configurations
¢ Delivers rapid access to archived data
¢ Especially in Compliant Write Once media , there is a
specially designed shred operation individual records written to
Compliant Write Once media can be destroyed on
7. UDO Development
The UDO disc founder, as the consortium is called, includes some of
the biggest names in consumer electronics media. The UDO technology
roadmap calls for future generations of 60GB and 120GB media
capacities with drive backward read compatibility to maximize
investment protection and ensure long-term data access. UDO
technology is available in a UDO Desktop Drive configuration for
small office and departmental applications and in G-Series
automated libraries for high capacity environments that require
fast access to archived data.
12.1 THE UDO MEDIA FOUNDERS
1. Sony Corporation
2. Plasmon (Mitsubishi Chemical)
Is it possible to have 500GB?
Now in market it is available 30GB capacity UDO disc. But it is now
developing up to 120GB. It will be soon available in the market. It
is possible to have 500GB UDO disc by using smaller wave length
lights (like UV rays) we can increase the capacity
8. UDO features
The core technology for UDO is essentially similar to Blue-ray
although there are a number of key differences. The main features
of UDO are:
(a) Authenticity and Trustworthiness
UDO provides absolute data authenticity for regulatory compliance
or for any application where archived information must remain 100%
unchanged. DO uses a patented Phase Change recording process that
permanently alters the molecular structure of true Write Once
media, ensuring data integrity at the most fundamental level. UDO
is also available with Rewritable media for archive environments
where data needs to be deleted or media capacity reused. Unlike
true Write Once media, Rewritable media allows the Phase Change
recording process to be reversed. Enhanced error correction
algorithms and read ahead defect management complement UDOs Phase
Change recording process to guarantee unparalleled data integrity.
b) Long-term Data Retention
UDO has been designed to provide decades of dependable data
retention. A highly stable recording surface, precision engineered
protective coating and durable cartridge delivers media life in
excess of 50years, minimizing the frequency of data migration and
virtually eliminating media maintenance. The UDO drive design is
robust and reduces the potential for contamination, enabling them
to withstand the rigors of continuous, long-term use.
© High Capacity and Scalability
Rapidly growing archive data volumes demand solutions with high
initial capacity and flexibility to scale over time. Blue laser
technology gives 30GBUDO more than three times the capacity of
previous generation MO (Magneto Optical) and DVD technologies. The
removability of UDO cartridges, combined with the off-line media
management capabilities of optical storage libraries, means
scalability is essentially unlimited. Rarely used data can be
removed from a library, freeing up capacity yet remaining managed
and accessible.
(d) Rapid Information Access
Knowledge assets are useless if they cannot be accessed when
needed. UDO has fast 35-milli second random access capability,
facilitating timely retrieval of relevant data. An 8K sector size
optimizes read/write performance across a wide range of file sizes.
UDO realizes additional performance by operating at Constant
Angular Velocity (CAV). During reads and writes the medias pins
continuously at the highest possible rate. In rewritable
applications, UDO features a unique direct over write capability,
doubling rewrite speeds by eliminating the need for a dedicated
erase pass.
(e) Low Total Cost of Ownership
UDO has a highly competitive archival storage TCO.With attractively
priced 30GB media, the acquisition cost of a UDO library compares
favorably with much less reliable tape or DVD solutions and costs a
fraction of hard disk-based systems. UDO's ISO standard 5.25 inch
media cartridge permits the use of MO and UDO media in the same
library, eliminating the necessity for migration from 9.1 MO media.
Planned introductions of backward-compatible 60GBand 120GB UDO
drives guarantee investment protection and minimize future
migration expense.
UDO drives and media are designed for longevity and drives operate
only when a cartridge is inserted -keeping overall maintenance and
operating costs extremely low. Combined with its inherent
authenticity and trustworthiness over time, outstanding capacity
and scalability and excellent random access attributes, UDO's low
TCO makes it the ideal solution for professional archive
applications and a key element of a comprehensive information life
cycle strategy.
9. Application & Markets
UDO is the only storage technology that delivers the secure
authentication of true Write Once storage with the permanence that
ensures the lowest possible Total Cost of Ownership. These
attributes are fundamental to many industries for the archival
storage of corporate documents, emails, customer records and
transaction data. Industries that benefit from UDO technology
include:
UDO for the Financial market
The properties of UDO make it extremely well suited to meet the
archival storage demands of financial institutions. UDO provides
the authenticity of true Write Once technology, rapid access to
decades of records and the media longevity required for the long-
term retention of important customer and transaction records.
Ensuring data authenticity is critical to regulation compliance and
to avoid costly litigation. As a result, many financial regulations
that define media types typically call for the use of unalterable
or Write Once media; making UDO the clear choice for financial
record archives.
UDO for the Insurance Market
UDO provides very fast access to random files. Load time for UDO
media is a few seconds and seek times are a fraction of a second so
any file in a multiple terabytes optical library can be accessed in
less than 10 seconds. Because the access cycle for data stored in
automated libraries with UDO media takes only a few seconds, UDO
library configurations operate extremely well in multi user, high
demand environments such as the insurance industry where there can
be hundreds of requests for archive data
UDO makes it possible for insurance companies to archive and
quickly access information that they may not have been able to in
the past. In this very competitive industry, the rapid data
availability provided by UDO can allow organizations to offer new
products and services and gain a competitive advantage.
UDO for the Healthcare market
Healthcare organizations demand high system capacities to meet the
enormous volume of medical images and records, while making sure
it's secure and cost effective. UDO meets these demands with high
media / system capacity and a low Total Cost of Ownership that is
unmatched by other storage media. The true Write Once nature of UDO
is ideally suited for medical applications since patient records
and medical images cannot be altered or lost. Since UDO uses non-
magnetic recording, data written to the media is not damaged by
exposure to magnetic fields, which can be a considerable risk where
powerful medical imaging equipment is in use. The convenience of
UDO's rugged, removable cartridge also gives hospitals the
flexibility to store large volumes of data within a library or to
easily remove older data to a vault for longer-term off-line
storage.
UDO for the Healthcare market
Healthcare organizations demand high system capacities to meet the
enormous volume of medical images and records, while making sure
it's secure and cost effective. UDO meets these demands with high
media / system capacity and a low Total Cost of Ownership that is
unmatched by other storage media. The true Write Once nature of UDO
is ideally suited for medical applications since patient records
and medical images cannot be altered or lost. Since UDO uses non-
magnetic recording, data written to the media is not damaged by
exposure to magnetic fields, which can be a considerable risk where
powerful medical imaging equipment is in use.
UDO for the Pharmaceutical market
While pharmaceutical research, development and filing application
records must be kept for decades, they are often infrequently
accessed. As a result, the archive media for these records must be
very cost effective, facilitate record authentication and provide
excellent longevity. The attributes of UDO match these requirements
extremely well. True Write Once technology affords the best
possible audit trail management to ensure data authenticity. Media
life in excess of 50 years acts to minimize data migration
frequency, it requires virtually zero media maintenance and minimal
operating costs. Pharmaceutical companies can write their records
onto stable UDO media and be certain the data is available years
later without the additional expense .
UDO for Legal environments
Data integrity and authenticity, a main concern for record
admissibility, is best achieved by Write Once technology, because
it provides a secure, unalterable format that facilitates clear
audit trails that enhance overall data trustworthiness. UDO's true
Write Once recording offers an unrivalled level of data integrity,
since the recording surface only permits data to be written a
single time and unique serial numbers on each piece of media
further add.
UDO for the Broadcasting Industry
Digital audio and video files require large amounts of storage
space and 30GB UDO media in combination with automated libraries
provides the capacity needed to meet the demand. Since many of
these files are a matter of public record, some will have
indefinite retention periods requiring stable media with a very
long life. UDO has a scientifically verified media life of over 50
years that gives the broadcast industry the opportunity to store
large volumes of data with virtually zero on-going maintenance. The
longevity of the media also means that data migration cycles can be
greatly extended, dramatically reducing the long-term cost of the
overall archive. The removability of UDO media also supports off-
line media vaulting, reducing archive storage costs and increasing
security over decades of archive life.
UDO for Governmental Organizations
The huge volume of records maintained and preserved by
governmental organizations worldwide calls for the most reliable
archival solution at the lowest possible cost and with quick access
characteristics. UDO meets all these requirements, offering
permanent media with professional quality hardware, cost effective
storage for years of operation and very fast access to huge data
archives. As a result of "freedom of information" laws, many
national, state and local governments must now respond rapidly to
citizen requests against a huge range of information.
.
10.UDO DRIVE
(DESK TOP DRIVE & INTERNAL DRIVE)
10.1DESK TOP DRIVE
UDO Desktop Drives bring professional archival storage to small
office and departmental environments at an affordable price.
Healthcare facilities, accounting and legal departments,
engineering and design offices, publishing houses and many other
businesses benefit from the high capacity, performance and
reliability of UDO Desktop Drives for the long-term storage of
their valuable information.
Engineered for demanding archive environments, UDO Drives are
certified with very high duty cycles that ensure reliable operation
in combination with fast seek times and high read/write speeds
optimized for the unique performance requirements of a data
archive.
The UDO Desktop drive supports Write Once UDO media for unmatched
data authenticity and compliance with industry regulations and UDO
Rewritable media for more general archive requirements that demand
data longevity while allowing older records to be erased and media
space reused.
The UDO Desktop Drive package includes a UDO drive in a compact,
attractive enclosure, external power supply, interface / power
cables, one piece of 30GB UDO Rewritable media and software drivers
for Windows and Linux operating systems.
10.2 INTERNAL DRIVE
UDO Internal Drives consist of a conventional UDO drive, but
without an external enclosure or power supply. Using an industry
standard half-height form factor, the UDO Internal Drive is
designed for easy installation into computer servers and
specialized peripheral devices such as medical imaging equipment,
digital recording devices, and document scanners.
UDO Drives Specifications Summary
Media Load Time 5 sec
Media Unload Time 3 sec
Average Seek Time 35 msec
Buffer Memory 32MB
Max Sustained Transfer Rate - Read 8 MB/s
Max Sustained Transfer Rate - Write 4 MB/s (with verification)
MSBF - Mean Swap Between Failure 750,000 load/unload cycles
MTBF - Mean Time Between Failure 100,000 hours
Interface Wide Ultra 2 LVD SCSI
11. UDO VS OTHER DISC FORMATS CD
CDs- compact disks - hold either 680 or 700MB of data. That's
sufficient for 80 minutes of music. They are used for music and
also for distributing software or storing digital data such as
images
CD: Compact Disc or CD-Audio, a digital storage medium formed of a
12cm diameter polycarbonate foundation layer coated with a
reflective metalized layer, and a protective lacquer coating. The
physical format of CDs is described by the ISO9660 .It rapidly
became apparent in the late 90s that the CD with its 680M or
slightly more capacity was insufficient. The consumer drive was for
a format that could hold more digital photos with the Holy Grail
being the storage of a whole movie.
DVD
DVDs are big advance incapacity over CDs, offering 4.7GB. Like
CDs, DVDs store data in microscopic grooves running in a spiral
around the disc.
DVD technology writes in smaller 'pits' to the recordable media
than CD technology. Smaller pits mean that the drive's laser must
produce a smaller spot. DVD technology achieves this by reducing
the laser's wavelength from the 780nm infrared light used in
standard CD.
Smaller data pits allow more pits per data track. The minimum pit
length of a single layer DVD-RAM is 0.4 micron as compared to 0.834
micron for a CD. Additionally, DVD tracks are closer together,
allowing more tracks per disc. Track pitch-the distance from the
center of one part of the spiral information or 'track' to the
adjacent part of the track-is smaller. On a 3.95GB DVD-R, track
pitch is 0.8 microns;CD track pitch is 1.6 micron, These narrow
tracks require special lasers for reading and writing †which can't
read CD-ROMs, CD-Rs, CD-RWs, or audio CDs. Most drive makers have
solved this problem by putting two lasers in their design.
Data access speeds
DVD accesses data faster than CD and uses more robust error
correction. In fact, the speed of DVD demands a new unit of
measure. CD drive speeds are expressed as multiples of that
format's original data transfer rate 'X,' or 150KB per second. A
32X CD-ROM drive reads data at 32 times 150KBps or 4MBps. DVD's 1X
is 1.38MBps. That's faster than an 8x CD drive.
And after DVDs
There are three optical formats that offer more than 8.5GB. These
are Plasmon's UDO, HD-DVD and Blue-ray. All three used blue laser
light. This has a narrower beam than red laser light.
UDO is positioned as a business data storage format. The others are
primarily consumer-focused with a secondary business storage use,
just like CDs and DVDs.UDO is developed from the earlier MO -
magneto-optical - disks.
Blue-ray: Blue-ray is a Sony-supported format and holds 25GB in
single layer form, but with two layers and double-sided recording,
could hold 100GB. Such capacities mean high-definition movies could
be stored. It needs a cartridge to hold it and the disk can't be
played in DVD-players.
HD-DVD: High-definition DVD. HD DVD is a 20GB capacity format
which could, via multiple layers hold more than 50GB. Disks don't
need cartridges.
MO: An older format with disks providing 9.1GB and were used for
business data archiving purposes.
UDO: A Plasmon-only format offering 30GB capacity for business
data storage purposes
12. CONCLUSION
Ultra Density Optical, the next generation 5¼ professional optical
data storage technology, has been developed based on phase change
technology. The first generation UDO drive incorporates a 405nm
blue laser diode with high numerical aperture, NA=0.7 objective
lens to realize a capacity of 30GB on a double-sided 5¼,
cartridged disc. Both true write once and high cyclability
rewritable UDO media have been developed for the multi-function
drive. Robust performance with excellent margins has been
demonstrated. The roadmap for UDO extends for at least three
generations, leading to media capacity of at least 120GB capacity.
The UDO roadmap was designed to use proven technologies at all
stages in order to ensure that products could be delivered on time
and to budget. Too often, companies try to push a new technology to
its limits too early and suffer the inevitable delays to program
schedules, cost overruns and failures to deliver to specifications.
In contrast, UDO takes the existing proven elements of Blue-ray
technology to deliver a family of professional data storage
products with the initial generation. Later generations push the
technology further as the industry develops the techniques required
to manufacture components required to an acceptable level.
REFRENCE
1. sonynet.com
2. plasmon.com
3. udo.com