| Noun | 1. | RAM disk - (computer science) a virtual drive that is created by setting aside part of the random-access memory to use as if it were a group of sectors; "access to a RAM disk is very fast but the data it contains is lost when the system is turned off" |
| (operating system, storage) | RAM disk - A memory-resident program which mimics a hard disk drive. It uses part of computer's RAM to store data which can be accessed as files. Unlike a real disk drive, this drive forgets all stored data when the computer is turned off. |