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Measurement of (1) the amount of time it takes a storage device to locate an item on a storage medium or (2) the time required to deliver an item from memory to the processor
Duplicate of a file, program, or disk that can be used in case the original is lost, damaged, or destroyed
Multisession CD onto which users can record their own items, such as text, graphics, and audio. Each part of a CD-R can be written on only one time, though one part of the disc can be written at one time and another part at a later time. Once recorded, a CD-R can be read from as many times as necessary, but its contents cannot be erased. CD-R is short for compact disc-recordable
Device that can read from CD-Rs, standard CD-ROMs, and usually audio CDs and can write to, or record, CD-Rs. Also called CD recorder 7.20
Type of optical disc that uses laser technology to store data, instructions, and information. A CD-ROM can contain text, graphics, video, and audio. Manufacturers write, or record, the contents of standard CD-ROMs in a single session, and users only can read the contents, not erase or modify them. A typical CD-ROM can hold from 650 MB to 1 GB of data. CD-ROM is short for compact disc read-only memory
Erasable CD onto which users can write and rewrite data, instructions, and information multiple times. CD-RW is short for compact disc-rewritable
Drive that can read from CD-RWs, CD-Rs, standard CD-ROMs, and usually audio CDs and can write to, or record, CD-RWs
Type of optical disc that can be erased and written to, or recorded on, more than 1,000 times. A DVD+RW is similar to a CD-RW, except it has storage capacities up to 3 GB per side. DVD+RW is short for DVD-rewriteable
Device that can read a DVD-ROM. Newer DVD-ROM drives also can read audio CDs, CD-ROMs, CD-Rs, and CD-RWs
Type of optical disc that can be erased and written to, or recorded on, more than 1,000 times.
Portable, inexpensive storage medium that consists of a thin, circular, flexible plastic Mylar film with a magnetic coating enclosed in a square-shaped plastic shell. Also called diskette
Type of storage device that contains one or more inflexible, circular platters that store data, instructions, and information. A hard disk stores data magnetically and is a read/write storage medium, meaning it can be read from and written to any number of times. Also called hard disk drive
A small sheet of film, usually about 4 inches by 6 inches in size, on which microscopic images of documents are stored
A roll of film, usually 100 to 215 feet long, on which microscopic images of documents are stored
The physical material on which a computer keeps data, instructions, and information, such as a floppy disk, Zip disk, hard disk, CD, DVD, tape, PC Card, or microfiche. Also called secondary storage
Magnetically coated ribbon of plastic that is capable of storing large amounts of data and information at a low cost. Business and home users use tape most often for long-term storage and backup
The smallest unit of disk space that stores data, consisting of two to eight sectors on a single track on a hard disk. A single allocation unit, which also is called a cluster or a block, holds data from only one file
The smallest unit of disk space that stores data, consisting of two to eight sectors on a single track on a hard disk. A single cluster, which also is called an allocation unit or a block, holds data from only one file
Type of data access in which the storage device is able to locate a particular data item or file immediately, without having to move consecutively through items stored in front of the desired data item or file. Also called random access
Portion of memory the processor uses to store frequently accessed items, which improves disk access times
Special-purpose chip and electronic circuits that control the transfer of data, instructions, and information between a disk and the system bus and other components in a computer. Sometimes called an interface
Interface used in controllers that can support up to four hard disks at 137 GB per disk, transfer data at speeds up to 66 MBps, and provide connections for CD, DVD, and tape drives. EIDE controllers are one of the more widely used controllers for hard disks
Name sometimes given to the hard disk inside a system unit, because the disk is mounted in a drive bay and usually is not portable
Type of hard disk failure that occurs when a read/write head touches the surface of a platter, usually resulting in a loss of data or sometimes loss of the entire drive
The number of kilobytes of data, instructions, and information that transfer to and from a device per second. KBps is short for kilobytes per second
works with specially coated optical discs, to etch lables directly on the disc
use magnetic particles to store items such as data, instructions, and information on disks surfaces
Disc that can be written to more than once, allowing users to save additional data on the disc at a later time
a type of storage media that consists of a flat, round, portable disc made of metal, plastic, and lacquer that is written and reas by a laser
by contrast, hard disks align the magnetic particles vertically, or perpendicular to the disk's surface, making much greater storage capacities posssible.
Type of data access in which the storage device is able to locate a particular data item or file immediately, without having to move consecutively through items stored in front of the desired data item or file. Also called direct access
the newest type of hard disk interface, uses serial signals to transfer data, instructions, and information.
Type of data access in which the storage device reads or writes data consecutively. In order to locate a particular data item or file, the device has to move consecutively through items stored in front of the desired data item or file before reaching the file
Disc that is written to only once and cannot be written to again. Manufacturers typically produce a single-session disc by writing all items on the disc at one time, before distributing the disc to users
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