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storage by Mind Map: storage
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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

Capacity ,Platters ,Read/Write Heads,Cylinders, Sectors and Tracks, Revolutions per Minute,TransferRate,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

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

A network attached storage (NAS) device is a server connected to a network with the sole purpose of providing storage

An external hard disk is a separate freestanding hard disk that connects to your computer with a cable or wirelessly

A removable hard disk is a hard disk that you insert and remove from a drive

Internal and external hard disks are available in miniature sizes (miniature hard disks)

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

Flash 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 disks

Faster access time, Faster transfer rates ,Generate less heat and consumeless power ,Last longer

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

CompactFlash (CF) ,Secure Digital(SD), Secure Digital High Capacity(SDHC) ,microSD,microSDH, CxD PictureCard,Memory Stick,Memory Stick Micro (M2)

USB flash drives plug into a USB port on a computer or mobile device

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

Developed by the PCMCIA

Commonly used in notebook computers

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

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

A CD-ROM can be read from but not written to read from a CD-ROM drive or CD-ROM player

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

A CD-RW is an erasable multisession disc must have a CD-RW drive

Archive disc

Stores photos from an online photo center

Resolution usually is 7200 pixels per photo

Cost is determined by the number of photos being stored

Picture CD

Single-session CD-ROM that stores digital versions of film

Typically uses a 1024 x 1536 resolution

Many photo centers offer Picture CD services

A DVD-ROM is a high-capacity optical disc on which users can read but not write or erase

A Blu-ray Disc-ROM (BD-ROM) has a storage capacity of 100 GB

DVD-RW, DVD+RW, and DVD+RAM are high-capacity rewritable DVD formats

Other Types of 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

Microfilm and microfiche store microscopic images of documents on a roll or sheet flim

Enterprise storage stores huge volumes of data and information for large businesses