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- Path: sparky!uunet!pipex!bnr.co.uk!bnrgate!nott!torn!cs.utexas.edu!rutgers!spcvxb!terry
- From: terry@spcvxb.spc.edu (Terry Kennedy, Operations Mgr.)
- Newsgroups: comp.periphs.scsi
- Subject: Re: How to use DC300 tapes in a QIC150 streamer?
- Message-ID: <1993Jan28.065405.5045@spcvxb.spc.edu>
- Date: 28 Jan 93 11:54:05 GMT
- References: <koenig.728156581@nova>
- Organization: St. Peter's College, US
- Lines: 28
-
- In article <koenig.728156581@nova>, koenig@nova.tat.physik.uni-tuebingen.de (Harald Koenig) writes:
- > I checked the holes at begin of tape (BOT) and found that hole pattern
- > is the same on DC300 and DC600 but the last hole (at BOT towards EOT)
- > on DC300 tapes has a smaller diameter. Is this THE? only difference
- > between DC300 and DC600 (not regarding diffs in magnetic material).
-
- Are you sure? Did you check the distance between the sets of holes at BOT?
- This is how drives determine the media type.
-
- Also, DC600 is not the correct media for a 150Mb drive. The correct media
- is DC6150 (150Mb, not to be confused with the 15Mb DC615, which is a short
- DC600) and DC6250 (250Mb). DC600A's should be readable in a 150Mb drive, as
- long as they are encoded in QIC-24 mode and not QIC-11, but probably will not
- be writable.
-
- The oxide on the tape is different (vastly different coercivity and abrasion
- characteristics) and the tape length is different as well. Assuming that you
- could force the drive to write the tape, I believe you will experience both a
- high initial write error rate and rapid degradation of the stored data (the
- timeframe for total loss should be a few weeks at most).
-
- While I can understand that high-density media may not be as available else-
- where, I'd encourage you to use the proper media for your drive even if it's
- hard to obtain / expensive / etc.
-
- Terry Kennedy Operations Manager, Academic Computing
- terry@spcvxa.bitnet St. Peter's College, Jersey City, NJ USA
- terry@spcvxa.spc.edu +1 201 915 9381
-