Storage Devices Sheet
BTT- Introduction to Information Technology in
Business
INFORMATION TECHNOLOGY REFERENCE MANUAL
Unit 1 - Information Technology – Sheet #3
“Storage Hardware (Devices)”
Refer to the slideshow to complete the following chart. Match the terms listed in the
“TERMS” box with the definitions provided on the following pages.
TERMS:
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Kilobyte
CD-ROM
Megabyte
Gigabyte
CDE or CD-RW
Diskette
Byte
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TERM
Storage hardware
Disk drive
Secondary storage
Cache memory
CD drive
ZIP/JAZ drive
Bit
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Primary storage
DVD ROM
ROM
CD-R
RAM
Terabyte
Hard disk
DEFINITION
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The smallest unit of capacity.
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Also called a floppy drive
A device that holds, spins, and reads data from and writes data to the
diskette.
A unit of capacity for mainframes and supercomputers
Approximately 1 trillion bites (1,009,511,627,776 bytes)
A unit of capacity.
1024 bytes.
Also called Hard Drive
Usually hold the software users need to perform tasks. They are faster
and hold more data than floppy disks.
Thin, but rigid, metal or glass platters covered with a substance that
allows data to be held in the form of magnetised spots
They are tightly sealed within an enclosed unit to prevent any foreign
matter from getting inside.
Inside, there are disk(s) on a drive spindle, read/write heads mounted
on an actuator (access) arm that moves back and forth, and power
connections and circuitry.
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Page 2
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Stands for Compact Disk - Read Only Memory
Holds up to 680 MG of data
An optical disk format that is used to hold software programs and data
once “burned”, a CD ROM cannot be written on or erased at a later time
Stands for Compact Disk – Erase or Compact Disk – Read, Write
An erasable or rewritable, optical disk
Uses magneto-optical disk – both magnetic and optical technologies
Each type is used to read: CD ROM, CD-R, CDE, CD-RW, DVD ROM, etc.
They can be internal or external
Use optical disk technology
Also called a floppy disk
A removable, round, flat piece of mylar plastic that stores data and
programs as electromagnetic charges on a metal oxide film that coats
the plastic.
Often called “floppy” because the disk is flexible, not rigid
A unit of capacity.
Represents one character, digit, or other value.
Comprised of 8 bits.
Removable hard disk drives
Hold gigs worth of data on hard disks. Disks can be removed and
replaced by others
A bridge between the processor and RAM
A special high-speed memory that the processor can access quickly.
It allows the processor to run faster because it doesn’t have to take
time to swap instructions in and out of RAM.
A silvery, 5-inch optically readable digital disk that looks like an audio
compact disk
Can store 4.7 – 17 GB
Great data storage, studio-quality video images, and theatre-like
surround sound through burning pits with a new generation laser
Short for Read-Only Memory
It cannot be written on or erased by the computer user.
The chips remember, permanently, information supplied by the
manufacturer.
One of the chips contains instructions that tell the processor what to do
when you first turn on, or “boot” the computer. (ROM bootstrap).
Stands for Random Access Memory
The more you have, the faster the software will operate
Is memory that temporarily holds data and instructions that will be
needed shortly by the processor. It is constantly being written on and
erased.
Devices used to store information in a relatively permanent manner
®i.e.: disks, tapes
Devices that provide a way of storing software and data in a form that
is relatively permanent
® information is NOT lost when the power is turned off
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A measurement of a microcomputer’s capacity.
Approximately 1 million bites (1, 048, 576 bytes)
Describes main memory, floppy disks, and CD ROMs.
A unit of capacity for hard drives and mainframes.
Approximately 1 billion bites (1, 073, 741, 824 bytes)
Stands for Compact Disk – Recordable
A CD format that allows users with CD-R drives to write data, only
once, only a specially manufactured disk than can then be read by a
standard CD-ROM drive
It is the temporary working storage of the computer
®contents ARE erased when power is turned off
It is contained on memory chips stored on the motherboard. The chips
remember, temporarily, information supplied by you or software.
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