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- From: afgun@engin.umich.edu (Andrew F Gunnesch)
- Newsgroups: comp.os.linux
- Subject: Re: Tape Drive Questions
- Followup-To: comp.os.linux
- Date: 28 Jan 1993 18:12:09 GMT
- Organization: What? We don't need no stinkin' organization
- Lines: 98
- Distribution: world
- Message-ID: <1k97lpINNhqd@srvr1.engin.umich.edu>
- NNTP-Posting-Host: beck.engin.umich.edu
- Summary: Quick QIC summary?
- Keywords: QIC
- In-Reply-To: <2250@osiris.bosch.de>
-
- In article <2250@osiris.bosch.de> mchapman@eis.k8.rt.bosch.de writes:
- >I asked these questions to the TAPE channel but got no answers except
- >for some hate mail telling me I should not be so dumb as to ask and
- >serveral mails saying "hey, I want to know the answers too!!"
- >So can someone **PLEASE** enlighten us all and post the answers here!
- >
- >What is Qic-02 Qic-36 Qic-80 and what is a colorado jumbo?
- >
- >Hey! I'm really confused! Can someone please enlighten me and
- >other ordinary mortals what all these qic numbers are. It
- >would also be good to know what tape drives from what manufacturers
- >are what standards.
- >
- >For instance the colorado jumbo 250MB drive. (Its adverised just
- >like that and nobody seems to be able to say what it is except that
- >it is QIC compatible!!!!) Is that QIC-125?
- >Could I read/write QIC 80 tapes with it?
- >Do I want to (for data interchange)?
- >
- >What is the most interchangable tape format?
- >
- >What interfaces are supported with linux up to now?
- >
- >What interface has a colorado jumbo, archive xxx, everex xxx etc?
- >
- >What are the chances of getting enough info from the
- >manufacturer to write/adapt a driver for it?
- >
- >What are the chances of someone who knows nothing about
- >tape drivers (but a bit about unix drivers) writing a driver
- >for it?
- >
- >What standard do people use to exchange tapes (QIC-80 QIC-125 ??)
- >
- >Any constructive enlightenment would be appreciated.
- >I think this is of sufficient interest to post any replies
- >to comp.os.linux.
- >
- >Thanks,
- >
- >Mike
-
- Here's what I can offer you. I'm not sure on the correctness, so
- please take my posting with a grain of salt.
-
- QIC-36 is a "basic" tape drive interface. The next step up is the
- QIC-02 intelligent interface. For SCSI, there is QIC-104/111 as an
- interface. Larger capacity drives use QIC-121, a SCSI-2 interface.
- Note that the QIC-36 interface can only do QIC-24 as a recording
- format.
-
- These drives have several recording formats. QIC-24, an older format,
- has a native capacity of 60MB, uncompressed, using the 600A tape.
- The next step up is QIC-120, using the 6150 tapes. You get 125 MB
- on a QIC-120 drive with this tape. A QIC-120 drive should be able
- to read QIC-24 tapes. Above this, there is QIC-150. On the 6150
- tape you will get 150 MB, and 250 MB on the 6250 tapes. Read compat-
- ibility is QIC24/120. QIC-525 uses DC 6525 cartridges for 525 MB or
- DC6320 cartridges for 320 MB. One of these drives should be able to
- read QIC-120 or 150 format tapes.
-
- Above and beyond this are completely SCSI drives, mostly SCSI-2 that
- do from 1 to 10 GB/tape, uncompressed.
-
-
- The minicartridge drives are a whole other ballgame. I'm not terribly
- familiar with those, suffice to say that common formats are QIC-40/80,
- and then QIC-100/128 and above.
-
- Colorado Jumbo drives are the minicartridge variety, and tend to run
- off of the floppy diskette drive controller.
-
- Many Archive, Everex, Wangtek drives are QIC-02 or the SCSI interface.
- I've had experience with this type.
-
- The drivers are not simple to write, and timing is critical in the
- floppy-controller style drives. Perhaps a bit too tight for reliable
- use under Linux. I do not know HOW complex one of these drivers is,
- though I've heard that someone has one in alpha testing. I've used
- Hennus Bergman's QIC-02 driver with my setup with good results, though
- my machine isn't fast enough to stream.
-
- Archive told me that my SC-400 is a QIC-36 card, but it DOES work with
- the QIC-02 driver for Archive cards.
-
- Hope this information is what you were looking for. Good luck, and
- please contribute to the development of Linux if you can!
-
- --andrew
- Andrew F. Gunnesch /-\ "I disapprove of what you say, but I will
- afgun@caen.engin.umich.edu | | __ __ __ defend to the death
- ==> Evil CAEN sysadmin <== |===| |__| | | | | | | your right to say
- What? I just work here | | | |__| |__ |__ |__| it." --Voltaire
- --
- Andrew F. Gunnesch /-\ "I disapprove of what you say, but I will
- afgun@caen.engin.umich.edu | | __ __ __ defend to the death
- ==> Evil CAEN sysadmin <== |===| |__| | | | | | | your right to say
- What? I just work here | | | |__| |__ |__ |__| it." --Voltaire
-