Disabling SCSI parity checking to dump disk on ACB4000 MFM-SCSI adapter?
engel at multicores.org
Wed Sep 23 13:51:39 CDT 2020
still working on backing up the Tektronix 440x disks. My current problem
is that the ACB4000 SCSI-to-MFM adapter doesn´t support SCSI parity.
I finally managed to find a PCI SCSI controller (Adaptec 2940) and a
Pentium 4 PC with PCI slots and installed OpenBSD 6.7. I disabled parity
checking in the Adaptec BIOS config and it detects a disk at ID 0 with
no name. So far, so good.
However, OpenBSD always seems to enable SCSI parity and complains about
disk parity errors. I tried to disable all lines in the aic7xxx and
ahc_pci driver source files that seem to enable parity, but nothing
seems to make a difference. The drive/ACB4000 is not detected by
OpenBSD, I get a "device not configured" error when accessing the disk
device files (/dev/sdxc and /dev/rsdxc).
Do you know if is there another OS which would make it easier to change
crucial SCSI parameters in the driver (config) or maybe a specialized
tool that could help me to image the disk?
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