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- Xref: sparky comp.unix.xenix.sco:3544 biz.sco.general:4844
- Newsgroups: comp.unix.xenix.sco,biz.sco.general
- Path: sparky!uunet!haven.umd.edu!darwin.sura.net!gatech!destroyer!mudos!mju
- From: mju@mudos.ann-arbor.mi.us (Marc Unangst)
- Subject: Re: Data recovery from a tar tape
- Message-ID: <BzvvLv.2Mz@mudos.ann-arbor.mi.us>
- Date: Sat, 26 Dec 1992 20:29:54 GMT
- References: <1992Dec26.114530.11218@hellgate.utah.edu>
- Organization: The Programmer's Pit Stop, Ann Arbor MI
- Lines: 30
-
- [This article did not belong in biz.sco.magazine, and is probably a
- good example of why the group should not have been created in the
- first place.]
-
- In article <1992Dec26.114530.11218@hellgate.utah.edu> henslee%jensen.cs.utah.edu@cs.utah.edu (Lane Henslee) writes:
- >there. Our clients were using tar to backup their data and towards
- >the end of the backup they were getting a message:
- >
- >"Insert new volume then press return to continue:"
- >
- >Instead of putting a new tape in they just pressed return and thought
- >everything was working perfectly. As near as we can figure the
- >"second" tape only had about 10 mb of data on it. Is there anyway to
- >recover data from the end of the "first" tape?
-
- No. When you write to the first track of a cartridge tape (QIC)
- drive, the erase bar is activated and all the tracks on the tape are
- erased at once. So even if you haven't written an entire track of
- data, there will be large gaps in the the data on the other tracks.
-
- This scenerio presents two very important lessons: 1) The person
- making the backups should have at least a minimal understanding of
- what is going on during the process; and 2) You should always check
- your backups to ensure they can be fully read back BEFORE you need them.
-
- --
- Marc Unangst, N8VRH | "Of course, in order to understand this you
- mju@mudos.ann-arbor.mi.us | have to remember that the nucleus of the atom
- | is squishy."
- | -W. Scheider, from a Physics lecture
-