Parameters

handle

The handle of the object representing the media to be read.

function

Set to MM_SEQUENTIAL_READ.

parameter1

Specifies the number of units to be read, where units refers to what was formerly called sectors on fixed media.

parameter2

Reserved. Set to zero.

parameter3

Reserved. Set to zero.

bufferLen

The size of the buffer (i.e., the number of units multiplied by the unit size) in bytes. The number of units ( parameter1) cannot exceed the maximum number of units as prescribed in the blockSize returned in a IOObjectMappingTableDef structure. The unitSize parameter is also returned in a IOObjectGenericInfoDef structure.

buffer

Points to a buffer in memory where the data is to be read.

returnParameter

The number of units read.