Path: utzoo!attcan!uunet!cbmvax!jesup
From: jesup@cbmvax.UUCP (Randell Jesup)
Newsgroups: comp.sys.amiga
Subject: Re: PPPppppplllleeeeeaaaasssseeee stop clicking
Message-ID: <5551@cbmvax.UUCP>
Date: 22 Dec 88 04:32:16 GMT
References: <742@zehntel.UUCP>
Reply-To: jesup@cbmvax.UUCP (Randell Jesup)
Organization: Commodore Technology, West Chester, PA
Lines: 20

In article <742@zehntel.UUCP> donw@zehntel (Don White) writes:
>
>     Can anyone at Commodore tell us why (in detail) the drives click? I know
>  they are looking for disk insertion, but HOW are they doing it and why?
>  Don't all drives have some kind of hardware to tell you if a drive is
>  loaded?  Couldn't drives be kept at one known location (like track 0)
>  where you KNOW there should be SOME information? ANd just do reads with
>  no more head positioning?

	Last time, so listen carefully:   :-)

	Drives only tell you if a disk has been inserted when you step
the head.  Stepping the head is much faster than reading a track.  SOME
(not all) drives won't try to step below track 0, but latch the diskchange
line anyway.  This is how noklickstart works, if you have the right drives.
Other drives bang the heads against the stop, making evil noises and 
perhaps hurting your drive.

-- 
Randell Jesup, Commodore Engineering {uunet|rutgers|allegra}!cbmvax!jesup