Hard disk drive
= Hard disk drive
{wiki}
A <data storage device> that records information magnetically on rotating platters. Accessing a sector can require moving a head to its track, waiting for the sector to rotate beneath it, and transferring the data. These contributions are <seek time>, <rotational latency> and <data transfer time>.<Operating Systems: Three Easy Pieces by Remzi H. Arpaci-Dusseau and others>[Chapter 37, Hard Disk Drives, §37.3, seek, rotation and transfer phases]{ref}