Secondary Storage

Secondary storage

Disk Caching

It is a mechanism for improving the time it takes to read from or write to a hard disk. Usually it is included as part of the hard disk. It can also be a specified portion of random access memory (RAM). The disk caching holds data that has recently been read and in some cases adjacent data areas that are likely to be accessed next.

Redundand arrays of inexpensive disk (RAID)

RAID can be implemented as Hardware or Software. A hardware RAID system requires a dedicated RAID Controller, on the other hand a software RAID doesn't require any additional hardware and is bundled as a feature in the operating system. Since hardware RAID employs dedicated controller setup for its implementation, it has performance benefits over the software RAID.

File compression and decompression

Image compression is minimizing the size in bytes of a graphics file without degrading the quality of the image to an unaccceptable level. The reduction infile size allows more images to be stored in a given amount of disk or memoryspace. It also reduces the time required for images to be sent over the Internet or downloaded from Web pages.