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Memory Systems by David Wang, Spencer Ng, Bruce Jacob

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CHAPTER 20

Drive Interface

The disk drive is not a stand-alone device. To fulfill its function as a device for storing user data, the disk drive needs to be attached to the user’s system, traditionally called the host. It operates by receiving requests, or I/O commands, from the host to either store the data that the host is sending to it or retrieve and return to the host some piece of data that the host had previously stored in the drive.

For the disk drive to provide its data storage service to a host, it needs to have a protocol established to receive I/O commands from the host and to signal back to the host their completions. The protocol also has to define the mechanisms for receiving the user data when asked to store them and returning ...

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