While writing a tool for ATAPI CD-RW drives I encountered following problem :
Using SPTI (both IOCTL_SCSI_PASS_THROUGH_DI
I'll illustrate this with following (fictional) 12-byte CDB:
FF FF FF FF FF FF FF FF FF FF FF FF
When you send this CDB it will appear on the bus (checked with hardware bus analyzer) as :
FF 1F FF FF FF FF FF FF FF FF FF FF
So, the 3 upper bits of the most significant nibble of byte 1 (=2nd byte) will be reset.
Normally this is not a problem since apparently no MMC commands use these bits.
Unless you are using vendor specific commands that do use byte 1... If this is the case you have a major problem !
- This problem will not occur in Windows NT 4 (only checked with IOCTL_SCSI_PASS_THROUGH)
- This problem will not occur when you use Adaptec's ASPI layer
- The problem has been verified on other SPTI implementations (so it's doubtful that this is caused by my code)
- Happens also with Windows 2000 service pack 1
So :
- Is this a known problem ?
- Are there any work-arounds ?
- Would writing a lower/upper filter driver to reconstruct the I/O request packet do the trick ? Only if there really isn't an alternative, since I don't look forward to doing this.
Thanks,
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by: aa571Posted on 2000-10-05 at 14:53:08ID: 4600920
This would appear to be happening in the class driver since it isn't happening with ASPI. Unless you can live with MS filtering out the 'lun' fields, then it looks like you are stuck writing the filter driver to bypass the class driver.
On the other hand, I haven't seen any vendor specific commands for cdrw that actually need these bits. I'd be interested in know what they are if you've found them. Perhaps there are other ways of doing the same thing without needing to use those commands....