Storage Devices by: Karma and Trix

Get Started. It's Free
or sign up with your email address
Rocket clouds
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. Advantages RAM can be written and read from allowing changes all the time Disadvantages 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. For example, ROM stores instructions for the computer Advantages Computer doesn't start up without ROM Disadvantages 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 Advantages Quick access to data Data can directly read from any part of the hard disk Some magnetic storage devices are very inexpensive. Most magnetic storage devices store very large amounts of data Disadvantages Gradually lose their charge over time (lostdata) Hard disk eventually fails which stops the computer from working Disk is fixed inside the computer which makes it difficult to transfer onto another computer Examples Floppy Disk Magnetic Tape 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 Advantages Memory can be retained even when the power is off With proper care, optical media can last a long time Good for archiving because data is preserved permanently without the possibility of overwriting Disadvantages Require special drives to read/write Does not provide enough data storage in comparison to other storage technologies Is expensive per GB/TB in comparison to other storage technologies Examples DVD-ROM 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 Advantages Faster start-up because there is no spin-up required Much faster than conventional disks Some of the devices are waterproof Disadvantages Slower than conventional disks for random write ups Price is still quite high per gb than conventional hard drives Examples Memory card Flash card Smart card