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From: lampi@stb.uucp (Michael Lampi)
Newsgroups: comp.sys.apollo
Subject: Disk Data Check errors
Summary: Best to re-INVOL after running FBS
Message-ID: <1990Feb14.195636.17067@stb.uucp>
Date: 14 Feb 90 19:56:36 GMT
Reply-To: lampi@stb.uucp (Michael Lampi)
Distribution: comp.sys.apollo
Organization: MDL Corporation, Torrance, CA 90508
Lines: 26

A message was recently posted asking about the significance of the message
"disk data check" after a system crash and reboot.

This message means that a portion of your disk has been "destroyed"; i.e.,
either the formatting has been corrupted, the area has been physically
altered (unlikely-->head crash?), or the data has been overwritten erroneously.

These problems typically appear after a power failure, electrical
storms, etc., where electrical problems get transmitted through the disk
head(s) to the disk surface.

The best solution is to offload your disk, run DEX and/or FBS to
locate any "new" badspots, run INVOL and reload your data.

An alternate solution is to rename the file(s) showing as "bad" in the error 
log files to some unused name (like badspotx), and add the disk
block(s) to the INVOL bad sector list.

On the other hand, your disk drive may be on the verge
of needing replacement, as some CDC and Tecstor disks start showing
these errors more and more frequently before failure.

Michael Lampi
MDL Corporation   (213) 782-7888   Fax (213) 782-7927
P. O. Box 745, Torrance, CA  90508
(Note new net address)