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Storage by Mind Map: Storage

1. Storage holds data, instructions, and information for future use

1.1. A storage medium is the physical material on which a computer keeps data, instructions, and information

2. Capacity

2.1. Capacity is the number of bytes a storage medium can hold

3. Storage device

3.1. A storage device is the computer hardware that records and/or retrieves items to and from storage media

3.2. Reading is the process of transferring items from a storage medium into memory

3.3. Writing is the process of transferring items from memory to a storage medium

4. Access time

4.1. The amount of time it takes a storage device to locate an item on a storage medium

4.2. The time required to deliver an item from memory to the processor

5. Hard disk

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

5.2. Hard disks can store data using longitudinal recording or perpendicular recording

5.3. Characteristics of a hard disk

5.3.1. New node

5.3.2. Platters

5.3.3. Read/Write Heads

5.3.4. New node

5.3.5. Sectors and Tracks

5.3.6. Revolutions per Minute

5.3.7. Transfer Rate

5.3.8. Access Time

5.4. The hard disk arms move the read/write head, which reads items and writes items in the drive

5.4.1. Location often is referred to by its cylinder

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

5.6. Always keep a backup of your hard disk

5.7. RAID

5.7.1. RAID (redundant array of independent disks) is a group of two or more integrated hard disk

5.8. Network attached storage

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

5.9. External hard disk

5.9.1. An external hard disk is a separate free-standing hard disk that connects to your computer with a cable or wirelessly

5.10. Removable hard disk

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

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

5.12. 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

5.12.1. SATA

5.12.2. EIDE

5.12.3. SCSI

5.12.4. SAS

6. Flash Memory Storage

6.1. Solid state drives

6.1.1. Solid state drives (SSDs) have several advantages over magnetic hard disks Faster access time Faster transfer rates Generate less heat and consume less power Last longer

6.2. Memory card

6.2.1. 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 microSDHC xD Picture Card Memory Stick Memory Stick Micro (M2)

6.3. USB flash drives

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

6.4. ExpressCard module

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

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

6.6. Commonly used in notebook computers

6.7. Developed by the PCMCIA

7. Cloud Storage

7.1. Users subscribe to cloud storage for a variety of reasons

7.1.1. Access files from any computer

7.1.2. Store large files instantaneously

7.1.3. Allow others to access their files

7.1.4. View time-critical data and images immediately

7.1.5. Store offsite backups

7.1.6. New node

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

8. Optical Discs

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

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

8.3. Read only vs. rewritable

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

8.5. Track is divided into evenly sized sectors

8.6. CD-ROM

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

8.7. CD-R

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

8.8. CD-RW

8.8.1. A CD-RW is an erasable multisession disc Must have a CD-RW drive

8.9. Archive disc

8.9.1. Stores photos from an online photo center

8.9.2. Resolution usually is 7200 pixels per photo

8.9.3. Cost is determined by the number of photos being stored

8.10. Picture CD

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

8.10.2. Typically uses a 1024 x 1536 resolution

8.10.3. Many photo centers offer Picture CD services

8.11. DVD-ROM

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

8.12. Blu-ray Disc-ROM

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

8.13. DVD-RW, DVD+RW, and DVD+RAM

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

9. Other Types of Storage

9.1. Tape

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

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

9.2. Magnetic stripe cards and smart cards

9.2.1. A magnetic stripe card contains a magnetic stripe that stores information

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

9.3. Microfilm and microfiche

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

9.4. Enterprise storage

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

10. Putting It All Together

10.1. Home user

10.1.1. 320 GB hard disk

10.1.2. Cloud storage

10.1.3. Optical disc drive

10.1.4. Card reader/writer

10.1.5. USB flash drive

10.2. Small Office/Home Office user

10.2.1. 1 TB hard disk

10.2.2. Cloud storage

10.2.3. Optical disc drive

10.2.4. External hard disk for backup

10.2.5. USB flash drive

10.3. New node

10.3.1. 250 GB hard disk

10.3.2. Cloud storage

10.3.3. Optical disc drive

10.3.4. Portable hard disk for backup

10.3.5. Card reader/writer

10.3.6. USB flash drive

10.4. Power User

10.4.1. 2.5 TB hard disk

10.4.2. Cloud storage

10.4.3. Optical disc drive

10.4.4. Portable hard disk for backup

10.4.5. USB flash drive

10.5. Enterprise User (desktop computer)

10.5.1. 1 TB hard disk

10.5.2. Optical disc drive

10.5.3. Smart card reader

10.5.4. Tape drive

10.5.5. USB flash drive

10.6. Enterprise User (server or mainframe)

10.6.1. Network storage server

10.6.2. 40 TB hard disk system

10.6.3. Optical disc server

10.6.4. Microfilm or microfiche

11. Summary

11.1. Various storage media and storage devices

11.2. Internal hard disks, external and removable hard disks, solid state drives, memory cards, USB flash drives, ExpressCard modules, cloud storage, CDs, DVDs, and Blue-ray Discs, tape, smart cards, and microfilm and microfiche