·New Serial IOCTLs
IOCTL_SERIAL_GET_STATS returns communication statistics for a serial device, including the number of characters transmitted/received and various errors. IOCTL_SERIAL_CLEAR_STATS resets the statistics values to zero. Serial drivers should implement these IOCTLs to support higher-level applications that require these statistics.
If a driver does not implement these IOCTLs, it should return an error and not modify the output buffer. If the modem driver is involved in processing the I/O, it adjusts the return value from error to success but only return zeros for the counter values.
·New Self-Monitoring Analysis and Reporting (SMART) IOCTLs
Three new IOCTLs have been added to support SMART reporting: SMART_GET_VERSION, SMART_RCV_DRIVE_DATA, and SMART_SEND_DRIVE_COMMAND. Any IDE drivers that support SMART must implement these IOTCLs.
·New Media Change Count in IOCTL_XXX_CHECK_VERIFY
CD-ROM and disk drivers that handle IOCTL_XXX_CHECK_VERIFY should handle the new optional parameter for media change count. This parameter provides a more accurate way to check for media changes, increasing system reliability.
·New Common IOCTL_STORAGE_XXX Control Codes
New IOCTL_STORAGE_XXX control codes replace the previous IOCTL_DeviceType_XXX control codes, where DeviceType was DISK, TAPE, or CDROM. For example, IOCTL_STORAGE_RESERVE replaces IOCTL_DISK_RESERVE, IOCTL_TAPE_RESERVE, and IOCTL_CDROM_RESERVE. The new storage control codes have identical values for function code, transfer method, and required access as the previous disk, tape, and CD-ROM codes.
Drivers that pass unrecognized IOCTLs to the SCSI class driver do not need to make any changes for these new IOCTLs.