Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!cs.utexas.edu!samsung!usc!apple!portal!cup.portal.com!ts
From: ts@cup.portal.com (Tim W Smith)
Newsgroups: comp.sys.mac.programmer
Subject: Re: SCSI Help
Message-ID: <33184@cup.portal.com>
Date: 25 Aug 90 02:35:25 GMT
References: <917@beguine.UUCP> <9927@goofy.Apple.COM>
Organization: The Portal System (TM)
Lines: 18

What do you mean by "completely erase"?  Do you want to wipe out the
partition table and the driver descriptor map and the driver?  If so,
you (probably) have to issue SCSI commands, since the driver will
(probably) only let you write in the HFS partition.

I say "probably" because I know of at least one driver that accepts
negative block addresses.  Block -1 is the block just before the
partition, etc.  A loop of the form

	for ( i = -1; ; --i )
	{
		write over block i, stop when errorr
	}

will allow you to erase these parts of the disk.  This is probably
a bug in the driver, however.

							Tim Smith