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- Newsgroups: comp.periphs.scsi
- Path: sparky!uunet!charon.amdahl.com!netcomsv!netcom.com!allanh
- From: allanh@netcom.com (Allan N. Hessenflow)
- Subject: Re: HP/Sun DAT compatibility
- Message-ID: <1993Jan27.223223.4033@netcom.com>
- Organization: Netcom - Online Communication Services (408 241-9760 guest)
- References: <1993Jan13.210947.27896@netcom.com> <9850059@hpcpbla.bri.hp.com>
- Date: Wed, 27 Jan 1993 22:32:23 GMT
- Lines: 25
-
- In article <9850059@hpcpbla.bri.hp.com> mark@hpcpbla.bri.hp.com (Mark Simms) writes:
- >I have a suspicion that this might be an incompatibility relating to
- >the HP and Sun tape drivers rather than the DAT drives themselves. HP
- >systems tend to write with large block sizes and Sun ones with small
- >block sizes. When the Sun system attempts to read the tape written on
- >the HP system, it gets the first 512 bytes and then falls over with an
- >illegal length record. This would explain why you get the first
- >directory entry.
- >...
-
- Thanks for the information; I now have both an HP DAT drive and a WangDAT
- 1300 on the Sun, so I tried some experiments. First, the HP drive can
- read tapes written on anything (the HP or WangDAT drive on the Sun or
- the HP drive on an HP). The WangDAT can read tapes it wrote or, if I
- use the following command to write the tapes, tapes the HP wrote:
- > tar cvf - files | dd of=/dev/whatever bs=512
-
- No matter what I do, I can't get the WangDAT to read tapes that I write
- with the HP drive any other way. This leads me to conclude that the
- WangDAT firmware can't handle long blocks.
-
- allan
-
- --
- Allan N. Hessenflow allanh@netcom.com
-