Sunday, 26 June 2011

Secondary Storage

Disk Caching
A disk cache is a mechanism for improving the time it takes to read from or write to a hard disk.  A disk cache can also be a specified portion of random access memory . It holds data that has recently been read and, in some cases, adjacent data areas that are likely to be accessed next. Write caching is also provided with some disk caches.

File Compression

File compression is commonly used when sending a file from one computer to another over a connection that has limited bandwidth. The compression basically makes the file smaller and, therefore, the sending of the file is faster.

File Decompression

 

File decompression is the reverse--the decoding of compressed data to restore the original data

Internet Hard Drive


The Internet hard drive will allow you to deposit your computer files into a remote hard drive,  then access those very same files from any other computer.

Optical Disk Drive


It is a disk drive that uses laser light or electromagnetic waves near the light spectrum as part of the process of reading or writing data to or from optical discs.

Solid - State Storage

It is a data storage device that uses solid-state memory to store persistent data with the intention of providing access in the same manner of a traditional block i/o hard disk drive.

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