1. Hard Drives

2. Hard Drives

3. Inside of a hard drive
Video

4. 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

5. 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