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Chapter 7: Storage by Mind Map: Chapter 7: Storage
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Chapter 7: Storage

Storage

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

Acess time

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

Cloud storage

Cloud storage is an Internet service that provides storage to computer users

Users subscribe to cloud storage for a variety of reasons

Access files from any computer

Store large files instantaneously

Allow others to access their files

View time‐critical data and images immediately

Store offsite backups

Provide data center functions

Hard Disks

A hard disk contains one or more inflexible, circular platters that use magnetic particles to store data, instructions, and information

Hard disks can store data using longitudinal recording or perpendicular recording

Characteristics of a hard disk include

Capacity

Platters

Read/Write Heads

Cylinders

Sectors and Tracks

Revolutions per Minute

Transfer Rate

Access Time

Formatting

is 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

The hard disk arms move the read/write head, which reads items and writes items in the drive, Location often is referred to by its cylinder

A head crash occurs when a read/write head touches the surface of a platter

Always keep a backup of your hard disk

Raid (redundant array of independent disks)

is a group of two or more integrated hard disks

network attached storage (NAS)

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

A disk controller consists of a special‐purpose chip and electronic circuits that control the transfer of data, instructions, and information from a disk to and from the system bus and other components of the computer

SATA

EIDE

SCSI

SAS

Flash StoragFlash Memory Storage

Flash memory chips are a type of solid state media and contain no moving parts

Solid state drives (SSDs)

have several advantages over magnetic hard disk, Faster access time, Faster transfer rates, Generate less heat and consume less power, Last longer

memory card

A memory card is a removable flash memory device that you insert and remove from a slot in a computer, mobile device, or card reader/writer

USB flash drives

plug into a USB port on a computer or mobile device

ExpressCard module

An ExpressCard module is a removable device that fits in an ExpressCard slot

Developed by the PCMCIA

Commonly used in notebook computers

Optical Discs

An optical disc consists of a flat, round, portable disc made of metal, plastic, and lacquer that is written and read by a laser

Typically store software, data, digital photos, movies, and music

Read only vs. rewritable

Optical discs commonly store items in a single track that spirals from the center of the disc to the edge

Track is divided into evenly sized sectors

Care of optical discs

CD‐ROM, can be read from but not written to • Read from a CD‐ROM drive or CD‐ROM player

CD‐R, is a multisession optical disc on which users can write, but not erase

CD‐RW, is an erasable multisession disc • Must have a CD‐RW drive

Other Types of StoragOther Storage

Tape is a magnetically coated ribbon of plastic capable of storing large amounts of data and information

A tape drive reads and writes data and information on a tape

A magnetic stripe card contains a magnetic stripe that stores information

A smart card stores data on a thin microprocessor embedded in the card