1. The amount of time it takes for data to be delivered from memory to the processor after the address for the data has been selected.
2. The time needed for a read/write head in a disk drive to locate a track on a disk. Access time is usually measured in milliseconds and is used as a performance measure for hard disks and CD-ROM drives. See also read/write head, seek time, settling time, wait state. Compare cycle time.
(Computer science) The interval between the time data is requested by the system and the time the data is provided by the drive
Or reaction time; In computing, the time taken by a computer, after an instruction has been given, to read from or write to memory.