Digital Storage

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Digital Storage by Mind Map: Digital Storage

1. Hard Drives

1.1. Definition

1.1.1. called Hard Disk Drive(HDD), Contain one or more inflexible, circular platters that use magnetic particle to store data, instructions, and information

1.2. Hard Disk Capacity

1.2.1. Number of platter the hard disk contain

1.2.2. Composition of magnetic coating on platters

1.2.3. Whether the disk use longitudinal or perpendicular recording

1.2.4. Density

1.3. Characteristic

1.3.1. Tracks

1.3.2. Sector

1.3.3. Platters

1.3.4. Read/write head,

1.4. SSD(Solid State Drive)

1.4.1. Advantage

1.4.1.1. faster access time

1.4.1.2. faster transfer rate

1.4.1.3. Defragmentation not required

1.5. External Hard Drive

1.5.1. Separate freestanding storage device that connects with cable to a USB port

2. Storage

2.1. Defination

2.1.1. Storage medium is the physical metarial that keep dat, information program, appication, etc.

2.1.2. Could storage keep information on servers/internet,

2.2. Storage variation

2.2.1. USB flash drive, memory card, external hard drive, cloud storage, network attached storage device, etc

2.3. Storage device Record/Retrieves

2.3.1. READING is the process of transferring item from a storage medium into memory

2.3.2. WRITING is the process of transferring item from memory to a storage medium

2.4. Volatility

2.4.1. VOLATILE- RAM. the contant are erased when the power is removed.

2.4.2. NON-VOLATILE - Storage. the contant is still remain when the power is off.

2.5. Access time meassure

2.5.1. Amount of time of storage device to locate an item on a storage medium

2.5.2. time required to delivered an item from memory to the processor

2.6. Comparison between Memory/storage

2.6.1. MEMORY - Has higher transfer rate,

2.6.1.1. Memory (most RAM)

2.6.1.1.1. Running the program and information require: Contant of screen display, Commands sent between components of computer such as hard drive, processor and video card

2.6.2. Storage - Has Slower transfer rate

2.6.2.1. SSDs and Hard Disk

2.6.2.1.1. Operating System, application: data and information

2.6.2.2. USB Flash Drives, Memory Cards

2.6.2.2.1. Digital photo or file to be transported

2.6.2.3. Optical disks

2.6.2.3.1. Software,Movies, Music.

3. Portable Flash Memory

3.1. 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. MicroSDHC

3.1.2. SDHC

3.1.3. CF

3.1.4. miniSD

4. Cloud Storage

4.1. Definition

4.1.1. internet service that provide storage to computer or mobile device user

5. Optical Disk

5.1. Definition

5.1.1. Consists of a flat, round, portable disk made of metal, plastic, and lecquer that is written and read by a laser

5.2. How laser read data

5.2.1. 1. A laser diode shine a light beam toward the disc

5.2.2. 2. if light strike a pit, it scatters. if light strike a land, it is reflected back toward the laser diode

5.2.3. 3. reflected light is deflected to a light sensing diode, which send a digital signal of 1 to the computer. absence of reflected light is read as a digital signal of 0

5.3. Commonly store item in a single track that spiral from the center of the disk to the edge

5.4. Type

5.4.1. CD-ROM

5.4.2. CD-R

5.4.3. CD-RW

5.4.4. DVD-ROM

6. Enterprise Storage

6.1. Definition

6.1.1. Allow large organizations to manage and store data and information using device intended

6.2. Network Attached storage

6.2.1. Server that place on a network with the sole propose of providing storage to user

6.3. Storage Area Network

6.3.1. High speed network with sole purpose of providing storage to other attached servers

6.4. Tape

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

7. Other Type

7.1. Magnetic stripe

7.2. Smard Card

7.3. RFID