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. Access times are greatly improved, because RAM is approximately a hundred 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. RAM disks can be used to store temporary data or hold uncompressed programs for short periods.
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