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storage medium

also called secondary storage is the physical material on which a computer keeps data, instructions and information


is the number of bytes a storage medium can hold

storage device

is the computer hardware that records and/or retrieves items to and from storage media


is the process of transferring data, instructions and information from memory to a storage medium


is the process of transferring these items from a storage medium into memory

access time

measures the amount of time it takes a storage device to locate an item on a storage medium or the time required to deliver an item from memory to the processor

hard disk

also called hard drive is a storage device that contains one or more inflexible circular platters that use magnetic particles to store data instructions and information

fixed disk

a hard disk that is mounted inside the system unit

longitudinal recording

aligned the magnetic particles horizontally around the surface of the disk

perpendicular recording

hard disk align the magnetic particles vertically or perpendicular to the disks surface making much greater storage capacities possible


made of aluminum, glass or ceramic and is coated with an alloy material that allows items to be recorded magnetically on its surface


the process of dividing the disk into tracks and sectors so that the operating system can store and locate data and information on the disk


a narrow recording band that forms a full circle on the surface of the disk


the smallest unit of disk space that stores data and information

allocation unit

each cluster that consist of two to eight sectors


is the vertical section of a track that passes through all platters

revolutions per minute

allows nearly instant access to all tracks and sectors on the platters

head crash

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 disk

disk cache

sometimes called a buffer consists of a memory chips on a hard disk that stores frequently accessed items such as data instructions and information

redundant array of independent disk

RAID is an ideal storage solution for users who must have the data available when they attempt to access it

network attached storage

NAS device is a server connected to a network with the sole purpose of providing storage

external hard disk

a separate freestanding hard disk that connects with a cable to a usb port or fire wire port on the system unit or communicates wirelessly

removable hard disk

a hard disk that you insert and remove from a drive


uses serial signals to transfer data, instructions, and information


is a hard disk interface that uses parallel signals to transfer data instructions an information


interfaces which also use parallel signals can support up to eight or fifteen peripheral devices

solid state drive

ssd is a storage device that typically uses flash memory to store data instructions and information

memory card

a removable flash memory device usually no bigger than 1.5 inches in height or width

USB flash drive

sometimes called a thumb drive is a flash memory storage device that plugs in a USB port on a computer or mobile device

express card module

a removable device about 75 mm long that fits in a slot

cloud storage

an internet service that provides storage to computer users

optical disk

is a type of storage media that consists of a flat, round, porable disc made of metal plastic and lacquer that is written and read by a laser

cd rom

compact disc read-only memory is a type of optical disc that users can read but not write or erase

cd r

compact dis recordable is a multisession optical disc on which users can write but not erase their own items

cd rw

compact disc rewritable is an erasable multisession disc you can write on multipe times

picture cd

a single session cd rom that stores digital versions of film using a jpg file format at lower resolution


a magnetically coated ribbon of plastic capable of storing large amounts of data and information at low cost

magnetic stripe card

a credit card entertainment card bank card or other similar card with a stripe that contains information identifying you and the card

smart card

which is similar in size to a credit card or atm card stores data on a thin microprocessor embedded in the cared


stores microscopic images of documents on a roll or sheet film

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