## Storage Device Driver Reference

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### Extended Disk Interface

The Extended Disk Interface provides a higher performance path for a limited set of commands. The advantages of this interface are:

Multiple I/O requests may be submitted in a single list.

Each request may transfer data to or from discontinuous areas of memory.

Each request may specify a priority to other I/O requests.

A file system can directly call the device driver to submit I/O requests, rather than going through the OS/2 kernel.

This interface may be used at interrupt time.

See Request Lists and Request Control for information about the format of the Extended Disk Interface "Request Lists".