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- Newsgroups: comp.unix.aix
- Path: sparky!uunet!shared!johnf
- From: johnf@shared.com (John Fusselman)
- Subject: Re: Tape Drive Question
- Message-ID: <1992Nov12.181508.51817@shared.com>
- Date: Thu, 12 Nov 92 18:15:08 GMT
- Distribution: usa
- References: <1992Nov7.233230.5951@awdprime.austin.ibm.com>
- Organization: Shared Financial Systems
- Lines: 22
-
- In <1992Nov7.233230.5951@awdprime.austin.ibm.com> whitey@hellcat.austin.ibm.com writes:
-
- >Does anyone know how to make the 1/4 SCSI tape drive on a 6000 write
- >in low-density mode where it is compatible with the 6157 tape drive
- >unit for the RT? I have tried using 15 and 16 density by using the
- >different /dev/rmt0.X special files but I still cannot read a tape on
- >an RT written from a 6000. It does work the other way around though.
-
- I expect that your RT's tape drive writes QIC-24 format, allowing 60
- megabytes per 600 foot tape, while your RS/6000 writes QIC-150 or
- QIC-120 only, 150 or 120 megabytes per tape, respectively. A QIC-150
- format writing drive can read QIC-24, but the QIC-24 writing drive
- can't read the higher density tape. In other words, higher density
- drives are backwards compatible in reading tapes but are limited to
- writing high density only.
-
- Note that once upon a time drives wrote QIC-11 format, 30 megabytes per
- tape max, and as newer systems were delivered with the ever changing
- state of the art standards - at that time QIC-24, they could read tapes
- written with older drives but write only the new standard.
- --
- --->>> My comments are my opinions and may not be shared by Shared <<<---
-