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- Newsgroups: comp.os.os2.misc
- Path: sparky!uunet!spool.mu.edu!umn.edu!csus.edu!netcom.com!samiam
- From: samiam@netcom.com (Scott Moore)
- Subject: TAPE drives for OS/2 2.x
- Message-ID: <1993Jan2.011723.7507@netcom.com>
- Summary: An overview of tape solutions for os/2
- Keywords: TAPE OS/2
- Organization: Netcom - Online Communication Services (408 241-9760 guest)
- Date: Sat, 2 Jan 1993 01:17:23 GMT
- Lines: 71
-
- I get a lot of questions on tape drives for os/2 2.0. I thought I would
- put some of this in a general letter.
-
- FIRST, I am not impartial by any means. My company is ExaByte !
-
- The tape solutions seem to divide into <$500, > $500 and > $1000 units.
- The < $500 solution by CMS (just out) seems to be the only os/2 2.0 specific
- unit in that catagory, but remember that just because it will not work under
- os/2 2.0 software does not eliminate it as a backup solution ! If you are
- an all FAT system, the attraction of the DOS based solution as that since
- os/2 is not running at the time, there is no problem with os/2 having
- "locked" files (like the EA files). If you create a dos boot disk with your
- tape software on it, you can think of this as a standalone tape operator
- disk, then just stop os/2, boot the disk, run the backup, and go back to os/2.
- This is how I am presently working, even though I do have os/2 2.x based
- software.
-
- As I have written here before, I am somewhat skeptical of the floppy controller
- based solutions, even though they are cheap. Here are the reasons:
-
- 1. Although they are driven by a floppy port, they are still
- incompatible with each other ! You must get software specifically
- for that drive, which is not transferable to other drives.
-
- 2. They are notoriously slow. Since they are driven just as a
- floppy, they are limited to the same data rate. Hours of time
- is not unusual for such drives.
-
- 3. In order to create a faster drive, you need a special driver
- card, again specific to that tape unit, typically $100.
-
- 4. Verifying that you actually wrote correctly requires a full
- reread, typically doulbling the time it takes to perform a
- backup.
-
- Taking the recent CMS introduction, the drive itself costs $250, the software
- needed to drive it under os/2 is $99, and the special controller card
- another $100. The resulting price, $449, is enough to buy a SCSI based
- solution provided that you allready own a SCSI controller card. Here are
- a few quoted from the Micro times here in Santa Clara:
-
- Archive Viper SCSI 250 meg 6mb/sec $469
- WangDAT 5150 250 meg $469
-
- These prices make more sense if you allready own the SCSI card. Also, a
- compliant SCSI drive will take standard SCSI based software, like the PD
- GTAR available on Hobbes. I have also used Novastor and Sytos. Also
- the fact that it is SCSI means that it has the kind of speed you need
- automatically.
- Finally, the format of these tapes is stable. While the QIC-80 tapes
- many or may not interchange with each other, a DC6250 cartridge using TAR
- format is virtually standard.
- The biggest disadvange to the drives is the 1/4 tape cartridges are rather
- large (this size of a small paperback book).
-
- The tape units we make (DAT's) are virtually unknown under $1000. The
- advantages of a DAT are the small size of the cartridge (smaller than an
- audio cassette), the large capacity (2 gigabytes) and the speed (search
- to any spot on the tape in 20 seconds, typical 250 meg backup in 15 minutes).
-
- As a said, not an unbiased viewpoint, but perhaps that should help you all
- who are shopping for tapes.
-
- [sam]
-
- --
- Scott A. Moore [SAM] | "Cash is more
- samiam@netcom.com | important than your
- Santa Cruz, CA USA | mother"
- 408-423-1624 | Allan Shugart - CEO Segate Corp.
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