Supporting Win2k scandisk IOCTLs

In my driver I create a device of type FILE_DEVICE_DISK. I have added
support for all the necessary IOCTLs so that windows can format my storage
device. But the Win2k-scandisk (right-click on drive, go to properties,
click on tools tab, click check now) still doesn’t work. It says “Windows
was unable to complete the disk check”. Chkdsk, however, does work. I think
the problem is that I do not support one of the IOCTLs that it is sending
(code 0x4d0008). Does anyone know what this IOCTL is?

Thanks
Brian


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