RAM file system

A RAM disk is a simulated disk drive that resides in memory.

RAM disks are designed to have significantly higher I/O performance than physical drives, and are typically used to overcome I/O bottlenecks with nonpersistent files. The maximum size of a RAM file system is limited by the amount of available system memory. You can create a file system on the RAM disk device to make it available for normal file system usage. Do not use RAM disks for persistent data, as all data is lost if the system crashes or reboots.