What is RAM Disk?

A RAM-Disk, Ramdisk or Ramdrive is a virtual solid state disk that uses a segment of active computer memory, RAM, as secondary storage, a role typically filled by hard drives. It allows you to create directories, copy files to and from it, etc.

Access times are greatly improved, because RAM is approximately a million times faster than hard drives. However, the volatility of RAM means that data will be lost if power is lost, e.g. when the computer is turned off.

Believe me.. Any software that is installed on Ram Disk works with rocket speed... I installed Photoshop for trial..

A ramdisk can perfectly be used to store :

- web content of web servers
- temporary index files and tables of database servers
- temporary files (TEMP and TMP environment variable) and "Temporary Internet Files"
- the scratch disk for Adobe Photoshop
- games and programs in general, reloading parts and data occurs many times faster
- audio and video capture / editing
- creation and playback of slide shows
- data that has to be written to CD, to prevent underrun during the burn process
- all kinds of data that may be lost (or MUST be lost for security reasons) at shutdown

The installed software can also be reloaded automatically at boot time from an image file or by means of a backup program.

(http://www.techtalkz.com/tech-reference/6107-tutorial-know-about-ram-disk.html#post2063239)