23-12-2017, 04:11 PM
SECONDARY MEMORY
*Secondary memory stores data permanently.
*Secondary memory is also known as external memory.
Examples: Magnetic tape. Magnetic Discs (Hard Disc, Floppy Disc),Optical Discs, Flash drives
*A magnetic tape is a recording medium consisting of a thin tape with coating of fine magnetic material used for recording data.
Hard Disk
*A hard disk is usually used inside the CPU.
*A hard disk is divided into tracks and sectors.
The activity of creating sectors and tracks on a hard disk is called
(a) Tracking (b) Sectoring
(c ) Plattering (d) Formatting
Ans : (d) Formatting
*The normal size of a Hard drive sector is
Ans : 512 bytes
*A hard disk used for storage externally as a substitute for portable storage is known as External hard disk
Floppy Disk
*Floppy disk was discovered by
Ans : Alan Shugart
*Size of a common floppy disk
Ans : 3.5 inches
*3.5 inches size floppy drives and floppy disks are developed by
Ans : SONY
*8 inches size floppy disks are developed by
Ans : IBM
*Storage capacity of a common floppy disk -
Ans : 1.44 MB
*The part of the computer where floppy disks are inserted is known as
Ans : Floppy disk drive
Optical discs
*Examples of optical disc are
Ans : CD, DVD, Blu ray disc
*Data on optical disc is stored in the form of light and dark pits.
*CD - Compact Disk
*Storage capacity of a standard CD
Ans : 650- 750 MB (70 minutes of audio)
*Diameter of a standard CD
Ans : 12 cm
*The term “Red book”, “Yellow book” and “Orange book refer to
Ans : CD ROM Standard
*DVD - Digital Versatile Disk (formally known as Digital Video Disk)
*Storage capacity of a common DVD
Ans : 4.7 GB
*Optical disk having high storage capacity
Ans : Blu-ray disk
*Storage capacity of a standard single layer Blu -ray disc
Ans : 25 GB
LASER
*The technology used in CD
Ans : LASER Technology
*LASER
Ans : Light Amplification by. Stimulated Emission of Radiation.
*LASER was discovered by -
Ans : Theodore Maiman
See the difference
*Technology which is used in the processor of a computer to stimulate a single processor into two virtual processors to the Operating System
Ans : Hyper threading technology
*Hyper threading technology allows a single procesor core to execute two independent threads simultaneously
*This technology makes a single physical processor appears as two logical processors.
*Combined two processors, their caches and cache controllers on to a single integrated circuit is called - Dual core technology
*Multi core technology - It is a type of architecture where a single physical processor contains the core logic of two or more processors, these processors are packaged into a single integrated circuits (IC).
*Multitasking - CPU executes multiple programmes at a time.
*Multiplexing - Multiplexing, is a network technique that integrates multiple analog and digital signals into a signal transmitted over a shared medium.
SASD & DASD
*A group of data storage devices that read their data in sequence are called - SASD (Sequential Access Storage Devices)
*Example of SASD devices - Magnetic tapes(Casettes)
*A group of data storage devices that can read their data in any order are called - DASD (Direct Access Storage Devices)
*Examples of DASD devices - Hard disk, Pen drive, CD, DVD etc.
Info Plus
*BIOS is stored in - Flash Memory Chip
CMOS
*CMOS - Complementary Metal -Oxide Semiconductor
*CMOS is an on-board, battery powered semiconductor chip inside the computers that stores information.
Flash Memory
*Flash memory is a non-volatile computer storage chip made up of EEPROM.
*Examples of flash memory storage devices are - USB Flash drive, Memory Cards
*Flash memory cards are widely used in Mobile phones, digital camera, industrial robotics etc.
