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A ramdisk is a filesystem that resides in volatile, random access memory. As such, any data written to that filesystem does not stay in that filesystem when the computer is turned off, unless the changes to that filesystem are written elsewhere to a filesystem residing in nonvolatile memory. However, it is for these reasons that ramdisks are used, as a scratch filesystem, where changes need not be kept, or in a kiosk-style orientation where any changes made to a system are not committed, and the original configuration can be loaded each time the computer is restarted.
Ramdisks are used also for certain Linux distributions (such as Damn Small Linux and Feather Linux), behaving as Live CDs, or distributions residing on bootable business card media, use ramdisks for the above reasons and the speed boost that RAM normally provides, often through a function called ToRAM.
Creating a ramdisk can also be done in Microsoft Windows with a program created by CENATEK called RAMDisk.
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