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Access time of a hard disk

Average duration in milliseconds that the read head of a hard disk moves a data block to another on a platter. As the number of trays and the speed is high, the better the access time. It is independent of connection type (IDE, SATA or SCSI).

Late 90s, the average access time was 13 ms, a current hard drive allows less than 8 ms. SSD drives, using flash memory, go up to 85 microseconds, almost 100 times less than the current mechanical disks.

Last update, 2011/04/16

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