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40 terms

chapter 7

STUDY
PLAY
storage medium
also called secondary storage is the physical material on which a computer keeps data, instructions and information
capacity
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
writing
is the process of transferring data, instructions and information from memory to a storage medium
reading
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
platter
made of aluminum, glass or ceramic and is coated with an alloy material that allows items to be recorded magnetically on its surface
formatting
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
track
a narrow recording band that forms a full circle on the surface of the disk
cluster
the smallest unit of disk space that stores data and information
allocation unit
each cluster that consist of two to eight sectors
cylinder
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
SATA
uses serial signals to transfer data, instructions, and information
EIDE
is a hard disk interface that uses parallel signals to transfer data instructions an information
SCSI
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
tape
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
microfilm
stores microscopic images of documents on a roll or sheet film