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Subjectempty blocks with NCR 53c810

I'm having a bit of disk trouble:

Sometimes the first 1024 bytes of a file on disk will be filled with
zeroes for no apparent reason. The strange thing is that it happens
to files that should not have been written to at all, e.g. /bin/bash,
almost as though a block-read had been transformed into a block-write
by a bit error. It happens very rarely (once every few months), and
I have not been able to reproduce it. Has anyone else seen this?

This is an NCR 53c810 running with the following:
ID0: FUJITSU Model: M1606S-512 Rev: 6404
Type: Direct-Access ANSI SCSI revision: 02
ID1: FUJITSU Model: M1606S-512 Rev: 6404
Type: Direct-Access ANSI SCSI revision: 02
ID4: SONY Model: CD-ROM CDU-76S Rev: 1.1c
Type: CD-ROM ANSI SCSI revision: 02

Fast scsi, sync transfers, and disconnect are all enabled in the driver.
Could one of these be causing the trouble?

Thanks for any hints...

Kai


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