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From: dillon@CORY.BERKELEY.EDU.UUCP
Newsgroups: comp.sys.amiga
Subject: Track 40 Blues SOLVED!!!!!  Delay() is the culprit!
Message-ID: <8703070244.AA13483@cory.Berkeley.EDU>
Date: Fri, 6-Mar-87 21:44:23 EST
Article-I.D.: cory.8703070244.AA13483
Posted: Fri Mar  6 21:44:23 1987
Date-Received: Sun, 8-Mar-87 11:44:37 EST
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: University of California at Berkeley
Lines: 23


	The test was simple.  If you run the following program in the
background:

	for (;;)
		Delay(0);

	You are GUARENTEED to get a disk write error!  The problem is in
DOS.  This is why HANOI running at full speed kills the machine... looking
at the source it calls Delay() with some argument that was set to
12 - N  , where N is the speed specified.  If you specify 0, it calls 
Delay(0).  This is also why Steve Drew's Manx version was dying a while back.

	By doing a directory on a cluttered disk with a large loop 
program running (for(;;) Delay(0)), you will also get read errors... what
you hear is AmigaDos trying twice to read a track ...  it misses a track,
seeks to cyl. 0 and then tries again.

	So far as I can tell, Delay(1) doesn't seem to cause any problems.

	I've forwarded this to carolyn so she can get it to the right people.

					-Matt