Saturday 18 June 2011

Secondary Storage

Disk Caching




Disc Caching is a process where portion of RAM which is used to speed up the access to data on a disk. The RAM cab also be a part of the disk drive itself which is sometimes called a hard disk cache or buffer. It can also be a general-purpose RAM in the computer that is reserved for use by the disk drive. Hard disk caches are more effective,but are much more expensive, and smaller.





File Compression



File compression is often used when sending a file from one computer to another by a connection that has limited bandwidth. It makes the file smaller which makes the sending of the file faster. When compressing a file and sending it to another computer that computer has to have a program that will decompress the file so that it can go back to being normal and used.




File Decompression



File Decompression is the encoding of data so that they can consume less space and bandwidth. It is the reverse of decoding of compressed data to restore the original data.


Internet Hard Drive



An Internet Hard Drive enables the user to access computer files such as pictures, documents or music from any computer as long as they are connected to the Internet. Internet hard drive allow you to save your computer files into a remote hard drive and then later access those very same files from any other computers.



Optical DISC Drive

An optical DISC drive is a storage medium from which data is read and written by lasers. It can store much more data which is up to 6 gigabytes than most portable magnetic media such as floppies.



Solid-state Storage




A solid-state storage is a nonvolatile and removable storage medium that employs integrated circuits rather than magnetic or optical media such as flash memory Universal Serial Bus(USB) devices and various propriety removable packages that is intended to replace external hard drives.

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