Parameters

function

0x0021 – write request.

parameter0

Specifies the number of units to be written.

parameter1

Specifies the logical unit number of the beginning unit.

parameter2

Not used.

bufferLength

The size of the buffer (the number of units multiplied by the unit size) in bytes, or the number of elements in the scatter/gather buffer.

buffer

Points to a buffer in memory where the data is written from or it points to a scatter/gather list of buffers (see Scatter/Gather List ).