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# 1.2.1.1 SYS_MEDIA_BLOCK_COMMAND_HANDLE Typedef

## C

    typedef uintptr_t SYS_MEDIA_BLOCK_COMMAND_HANDLE;

## Summary

Handle identifying block commands of the media.

## Description

A block command handle is returned by a call to the Read, Write, or Erase functions. This handle allows the application to track the completion of the operation. The handle is returned back to the client by the "event handler callback" function registered with the driver.

The handle assigned to a client request expires when the client has been notified of the completion of the operation (after event handler function that notifies the client returns) or after the buffer has been retired by the driver if no event handler callback was set.

## Remarks

None.