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: · · · · · · · Kilobyte CD-ROM Megabyte Gigabyte CDE or CD-RW Diskette Byte · · · · · · · TERM Storage hardware Disk drive Secondary storage Cache memory CD drive ZIP/JAZ drive Bit · · · · · · · Primary storage DVD ROM ROM CD-R RAM Terabyte Hard disk DEFINITION · The smallest unit of capacity. · · 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. · · · · · · · · · Page 2 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 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 Page 3 · · · · · · · · · 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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