Module 4 Digital Storage: Preserving Content Locally and on the Cloud

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Module 4 Digital Storage: Preserving Content Locally and on the Cloud by Mind Map: Module 4  Digital Storage: Preserving Content Locally and on the Cloud

1. 1. What is Storage?

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

1.2. a) Storage Capacity

1.2.1. Is the number of bytes a storage medium can hold Kilobyte (KB), Megabyte (MB), Gigabyte (GB), Terabyte (TB), Petabyte (PB), Exabyte (EB), Zettabyte (ZB), Yottabyte (YB)

1.3. b) Illustration of volatility

1.3.1. a) Volatile :- its contents disappear when power is removed E.g:- Screen display & RAM

1.3.2. b) Non-volatile :- Its contents remain when power is off. E.g:- Storage

1.4. c) Storage access time

1.4.1. - 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

2. 2. Characteristic of

2.1. Hard disks

2.1.1. Also called a hard disk drive (HDD) contains one or more inflexible, circular platters that use magnetic particles to store data, instructions, and information -Tracks -Sectors -Platters -Form factor -Read/write head -Revolutions per minute

2.2. Solid state drive ( SSD)

2.2.1. is a flash memory storage device that contains its own processor to manage its storage Faster access times Faster transfer rates More durable Less power consumption Longer life

2.3. External hard drives

2.3.1. 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

2.4. Redundant array of independent disks (RAID).

2.4.1. is a group of two or more integrated hard drives

3. 3) Portable flash memory storage

3.1. Memory card

3.1.1. - removable flash memory storage device. - insert and remove from a slot in a computer, mobile device or card reader or writer.

3.2. USB flash

3.2.1. plug into a USB port on a computer or mobile device

4. 4) What is optical dics and its characteristics

4.1. Optical dics consists of a flat, round, portable disc made of metal, plastic, and lacquer that is written and read by a laser

4.2. CD-ROM

4.2.1. can be read from but not written to - Single-session disc

4.3. CD-RW

4.3.1. is an optical disc on which users can write once, but not erase

4.4. CD-R

4.4.1. is an erasable multi-session disc

4.5. DVD-R or DVD+R

4.5.1. is a high-capacity optical disc on which users can read but not write on or erase

4.6. DVD-ROM

4.6.1. are competing DVD-recordable WORM formats, on which users can write once but not erase

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

4.7.1. competing DVD-rewritable formats that users can write on multiple times

5. 5) Enterprise storage

5.1. a) RAID

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

5.2. b) Network attached storage, NAS

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

5.3. c) Storage area network, SAN

5.3.1. is a high-speed network with the sole purpose of providing storage to other attached servers

5.4. d) TAPE

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

6. 6) Other types of storage

6.1. Magnetic stripe card

6.1.1. has a magnetic stripe that contains information

6.2. Smart card

6.2.1. stores data on an integrated circuit embedded in the card

6.3. RFID Tag

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

6.4. NFC chips and tags

6.4.1. -An NFC-enabled device contains an NFC chip -An NFC tag contains a chip and an antenna that contains information to be transmitted -Most NFC tags are self-adhesive