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Path: utzoo!attcan!uunet!lll-winken!lll-lcc!ames!ncar!mailrus!caen.engin.umich.edu!falken
From: falken@caen.engin.umich.edu (David R  Falkenburg)
Newsgroups: comp.unix.aux,comp.sys.mac,comp.periphs
Subject: Re: A/UX generic SCSI driver and Syquest 44Mb removable drives
Summary: SCSI Block size
Keywords: A/UX SCSI driver Syquest
Message-ID: <40443764.1285f@maize.engin.umich.edu>
Date: 15 Dec 88 09:03:00 GMT
References: <4370@Portia.Stanford.EDU>
Organization: U of M Engineering, Ann Arbor, Mich.
Lines: 29

In article <4370@Portia.Stanford.EDU>, name@Portia.Stanford.EDU (tony cooper) writes:
> But the generic SCSI driver that A/UX uses does not work with the Syquest.
> It produces the error "More data than SCSI device requested" when trying
> to read or write to the drive.
> 
> Thanks,
> Tony Cooper
> 
> name@portia.stanford.EDU

You wouldn't happen to know what the formmated block size is set to
on that drive?  It sounds like the drive may be using 1024 byte blocks
(instead of the "normal" 512 byte variety)  This shouldn't cause a problem
under MacOS because the software driver could handle the data shuffling
easily, while A/UX WANTS a 512 byte/block device.

Most MacOS SCSI Drivers (i.e. one's whcih utilize the ROM SCSI driver)
usually ignore any extra data that might be associated with a transfer
durning teh data phase.

If you have SCSI Tool 1.1 from ArborWorks Software, you *could* issue
a MODE_SELECT command & issue a FORMAT_UNIT to try and hack it to
work.  If you can get 512 byte blocks, AU/X will probably work on it

-dave falkenburg


-- 
Dave Falkenburg @ University of Michigan Computer Aided Engineering Network
ARPA: falken@caen.engin.umich.edu    UUCP: umix!caen.engin.umich.edu!falken