Storage Devices by: Karma and Trix

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Storage Devices by: Karma and Trix by Mind Map: Storage Devices by: Karma and Trix

1. Primary

1.1. RAM - Random Access Memory

1.1.1. RAM is fast, temporary type of memory.

1.1.1.1. Advantages

1.1.1.1.1. RAM can be written and read from allowing changes all the time

1.1.1.2. Disadvantages

1.1.1.2.1. If a computer loses power, all data stored in its RAM is lost

1.2. ROM - Read Only Memory

1.2.1. ROM is memory that can not be changed by a program or a user. The ROM stays even after the computer is turned off.

1.2.1.1. For example, ROM stores instructions for the computer

1.2.1.2. Advantages

1.2.1.2.1. Computer doesn't start up without ROM

1.2.1.3. Disadvantages

1.2.1.3.1. Stored info can be lost when power is turned off

2. Secondary

2.1. Magnetic

2.1.1. Magnetic Storage uses a magnetic surface to hold info/data

2.1.1.1. Advantages

2.1.1.1.1. Quick access to data

2.1.1.1.2. Data can directly read from any part of the hard disk

2.1.1.1.3. Some magnetic storage devices are very inexpensive.

2.1.1.1.4. Most magnetic storage devices store very large amounts of data

2.1.1.2. Disadvantages

2.1.1.2.1. Gradually lose their charge over time (lostdata)

2.1.1.2.2. Hard disk eventually fails which stops the computer from working

2.1.1.2.3. Disk is fixed inside the computer which makes it difficult to transfer onto another computer

2.1.1.3. Examples

2.1.1.3.1. Floppy Disk

2.1.1.3.2. Magnetic Tape

2.1.1.3.3. Hard Disk Drive

2.2. Optical

2.2.1. Optical Storage on a disc uses series of dots that can be read by a light but usually machines use lasers to read such discs

2.2.1.1. Advantages

2.2.1.1.1. Memory can be retained even when the power is off

2.2.1.1.2. With proper care, optical media can last a long time

2.2.1.1.3. Good for archiving because data is preserved permanently without the possibility of overwriting

2.2.1.2. Disadvantages

2.2.1.2.1. Require special drives to read/write

2.2.1.2.2. Does not provide enough data storage in comparison to other storage technologies

2.2.1.2.3. Is expensive per GB/TB in comparison to other storage technologies

2.2.1.3. Examples

2.2.1.3.1. DVD-ROM

2.2.1.3.2. CD-ROM

2.3. Solid State

2.3.1. Solid State don't use reels of tape or spinning discs though they do use a series of 1's and 0's within electrical transistors

2.3.1.1. Advantages

2.3.1.1.1. Faster start-up because there is no spin-up required

2.3.1.1.2. Much faster than conventional disks

2.3.1.1.3. Some of the devices are waterproof

2.3.1.2. Disadvantages

2.3.1.2.1. Slower than conventional disks for random write ups

2.3.1.2.2. Price is still quite high per gb than conventional hard drives

2.3.1.3. Examples

2.3.1.3.1. Memory card

2.3.1.3.2. Flash card

2.3.1.3.3. Smart card