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- Path: sparky!uunet!spool.mu.edu!agate!ucbvax!NSCVAX.PRINCETON.EDU!dragon
- From: dragon@NSCVAX.PRINCETON.EDU (Mighty Firebreather)
- Newsgroups: comp.os.vms
- Subject: RE: HELP! Damaged disk
- Message-ID: <009602B6.23C1B840.12111@nscvax.princeton.edu>
- Date: 5 Sep 92 19:13:01 GMT
- Sender: daemon@ucbvax.BERKELEY.EDU
- Distribution: world
- Organization: The Internet
- Lines: 36
-
-
- Erkki Aalto <Erkki.Aalto@Helsinki.FI> writes:
- >
- >Lightning has damaged directory information on a MicroVAX II disk in Mets{hovi
- >Observatory. The disk contains two weeks' astronomical measurements.
- >DEC would take FIM 800 per hour for salvaging the data. Does anyone have any
- >experience on cases like this? Is there something we could do ourselves,
- >and approximately how long would it take from DEC?
- >
-
- Before you do *anything* else, do BACKUP /PHYSICAL ddcn:. Having
- done this, you can always return to where you are now, regardless of any
- further damage done in your efforts to recover your data.
-
- What you can do depends very strongly on exactly what has happened
- to the drive. In the simplest case, you can use ANALYZE /DISK_STRUCTURE
- /REPAIR /CONFIRM ddcn: to locate all the files that are not entered in a
- directory and enter them in ddcn:[SYSLOST].
-
- If INDEXF.SYS has been damaged, the outlook is poor since this is
- where the pointers to the disk blocks owned by the file are stored. In
- this case, the only thing that I can suggest would be to start examinining
- all the space on the disk that is not pointed to by the remaining entries
- in INDEXF.SYS to try to identify the contents. Recovery at this level is
- probably possible only as a joint effort between DEC and the owners of the
- data, DEC supplying the knowledge of ODS-2 and the tools to be used and the
- owners of the data identifying what they can.
-
- *************************************************************************
- * *
- * Here, there be dragons! *
- * dragon@nscvax.princeton.edu *
- * *
- * Richard B. Gilbert *
- *************************************************************************
-
-