If you are working on a server, and find that when you "trash" (dismount)
the INTERNAL volume, you get a message that says "Volume is trashed Master
Directory Block Bad". Although there may be no other immediate ill effect,
ignoring a message of this nature is not a good idea. BACK UP the volume in
question before proceeding.
After you have made a backup, shut the server down and run AppleShare
Admin. The purpose here is to use AppleShare Admin to verify the volume. It
is likely that it will also report some form of error. Also, try testing
the drive at a lower level using HD SC Setup. If the drive passes the test,
and you have run AppleShare Admin, try bringing the server back up.
If the message continues to appear, try some disk utilities on the drive --
beginning with Disk First Aid as another test, and then on to a package
such as Symantec Utilities. If none of this works, we would suggest
reformatting the drive and restoring it from the backup.
Although this is potentially a lot of work, the integrity of master
directory blocks is critical and well worth the effort -- if only for peace
of mind.