Hard Drives.

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Presentation transcript:

Hard Drives

Hard Drives

Inside of a hard drive Video

Hard Drives Terms read/write head block size track cylinder sector The part of the arm that touches the disk to read/write block size Number of bytes that are read/written in a single read of write operation track Ring around a disk platter cylinder The set of corresponding tracks from all platters sector Section of a track

Disk Latency What are the two moving parts of a disk? Platter spinning around ~ rotational delay (sector wait time) Arm w/ head moving across platter (track seek time) How long does it take to access something on the disk? Access time = track seek time + sector wait time