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Block device drivers respond to this I/O control code in order to service FAT file system requests to read data from the block device.
In Windows CE 3.0 and later, this code is now called IOCTL_DISK_READ. When this function returns, the FAT file system expects the sr_statusmember of SG_REQto be set to either ERROR_SUCCESS if the read succeeded, or a standard error return value, otherwise. Certain errors are automatically retried, such as ERROR_BAD_UNIT if the device has been removed and ERROR_NOT_READY if the driver is shutting down or starting up. Block device drivers should return ERROR_GEN_FAILURE for any unknown or unexpected errors.
The FAT file system fills in the SG_REQstructure passed to the block device driver as follows:
If sr_num_sgis greater than 1, the block device driver should fill in additional entries in the sr_sglistarray.
|Runs on||Versions||Defined in||Include||Link to|
|Windows CE OS||1.0 and later|
Note This API is part of the complete Windows CE OS package as provided by Microsoft. The functionality of a particular platform is determined by the original equipment manufacturer (OEM) and some devices may not support this API.
Last updated on Tuesday, July 13, 2004