Xref: utzoo comp.periphs:1222 comp.unix.wizards:11578
Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!rutgers!apple!bionet!agate!ucbvax!decwrl!labrea!polya!kaufman
From: kaufman@polya.Stanford.EDU (Marc T. Kaufman)
Newsgroups: comp.periphs,comp.unix.wizards
Subject: Re: query: new disk drive for VAX
Message-ID: <4329@polya.Stanford.EDU>
Date: 7 Oct 88 05:01:49 GMT
References: <4198@bsu-cs.UUCP> <3531@phri.UUCP> <10199@eddie.MIT.EDU> <18529@uflorida.cis.ufl.EDU> <10209@eddie.MIT.EDU> <4559@lynx.UUCP>
Reply-To: kaufman@polya.Stanford.EDU (Marc T. Kaufman)
Organization: Stanford University
Lines: 17

In article <4559@lynx.UUCP> m5@lynx.UUCP (Mike McNally) writes:

>One interesting thing about Maxtors: we have a 5.25 inch full-height 
>SCSI drive (170MB).  It only responds to the "test unit ready" command
>when it's ready; otherwise, the command isn't acknowledged.  Think
>about it.

From ANS X3.121-1986 (p.62):
  "The TEST UNIT READY command (table 7-2) provides a means to check if the
logical unit is ready.  This is not a request for a self test.  If the logical
unit would accept an appropriate medium-access command without returning
CHECK CONDITION status, this command shall return a GOOD status."

See -- it says nothing about what to do if the drive is not ready :-)
I expect that the correct response would be BUSY.

Marc Kaufman (kaufman@polya.stanford.edu)