Digital Storage

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Digital Storage by Mind Map: Digital Storage

1. Storage

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

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

1.2.1. reading is the process of transferring items from a storage medium into memory.

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

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

1.3.1. Kilobyte (KB)

1.3.2. Megabyte (MB)

1.3.3. Gigabyte (GB)

1.3.4. Terabyte (TB)

1.3.5. Petabyte (PB)

1.3.6. Exabyte (EB)

1.3.7. Zettabyte (ZB)

1.3.8. Yottabyte (YB)

1.4. Volatile : Any data contents remains when the power is removed.

1.5. Non-volatile : Any data content won't remain when the power is removed.

1.6. Access time measures.

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

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

2. Hard Drives

2.1. A hard disk, also called a hard disk drive (HDD) contains one or more inflexible, circular platters that use magnetic particles to store data, instructions, and information

2.2. The storage capacity of hard disks varies and is determined by:

2.2.1. Whether the disk uses longitudinal or perpendicular recording

2.2.2. The composition of the magnetic coating on the platters

2.2.3. The number of platters the hard disk contains

2.2.4. Density

2.3. Formatting is the process of dividing the disk into tracks and sectors

2.4. Characteristics of a hard disk include:

2.4.1. Tracks

2.4.2. Sectors

2.4.3. Platters

2.4.4. Form factor

2.4.5. Read/write head

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

2.4.5.2. Always keep a backup of your hard disk

2.4.6. Revolutions per minute

2.5. An SSD (solid state drive) is a flash memory storage device that contains its own processor to manage its storage

2.5.1. advantages

2.5.1.1. Faster access times

2.5.1.2. Faster transfer rates

2.5.1.3. Quieter operation

2.5.1.4. Lighter weight

2.5.1.5. More durable

2.6. An external hard drive is a separate freestanding storage device that connects with a cable to a USB port or other port on a computer or mobile device

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

3. Portable Flash Memory Storage

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

3.1.1. SDHC

3.1.2. SDXC

3.1.3. miniSD

3.1.4. microSDHC

3.1.5. microSDXC

3.1.6. CF

3.1.7. xD Picture Card

3.1.8. Memory Stick PRO Duo

3.1.9. M2

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

4. Cloud storage

4.1. An Internet service that provides storage to computer or mobile device users

5. Optical Discs

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

5.1.1. CD-ROM

5.1.2. CD-R

5.1.3. CD-RW

5.1.4. DVD-ROM

5.1.5. DVD-R or DVD+R

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

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

5.3. Track is divided into evenly sized sectors

6. Enterprise Storage

6.1. Enterprise hardware allows large organizations to manage and store data and information using devices intended for heavy use, maximum efficiency, and maximum availability

6.1.1. RAID duplicates data, instructions, and information to improve data reliability

6.2. Network attached storage (NAS)

6.2.1. A server that is placed on a network with the sole purpose of providing storage to users, computers, and devices attached to the network

6.3. Storage area network (SAN)

6.3.1. A high-speed network with the sole purpose of providing storage to other attached servers

6.4. Tape

6.4.1. A magnetically coated ribbon of plastic capable of storing large amounts of data and information

6.4.2. A tape drive reads and writes data and information on a magnetic tape

7. Other Types of Storage

7.1. A magnetic stripe card has a magnetic stripe that contains information

7.2. A smart card stores data on an integrated circuit embedded in the card

7.3. RFID tag

7.3.1. Consists of an antenna and a memory chip that contains the information to be transmitted via radio waves

7.3.2. RFID reader reads the radio signal and transfers the information to a computer or computing device

7.4. NFC-enabled

7.4.1. Contains an NFC chip

7.4.2. NFC tag contains a chip and an antenna that contains information to be transmitted

7.4.3. Most NFC tags are self-adhesive