Path: utzoo!mnetor!uunet!tektronix!tekgen!tekigm2!phils
From: phils@tekigm2.TEK.COM (Philip E Staub)
Newsgroups: comp.sys.amiga
Subject: Re: Warm Reboot and Hard Disk Noise
Message-ID: <2897@tekigm2.TEK.COM>
Date: 4 May 88 15:58:49 GMT
References: <8804300422.AA18746@decwrl.dec.com> <12083@tut.cis.ohio-state.edu> <20570@sci.UUCP>
Reply-To: phils@tekigm2.UUCP (Philip E Staub)
Organization: Tektronix, Inc., Beaverton, OR.
Lines: 31

In article <20570@sci.UUCP> raymund@sci.UUCP (Raymund Galvin) writes:
>In article <12083@tut.cis.ohio-state.edu>, erd@tut.cis.ohio-state.edu (Ethan R. Dicks) writes:
>< 
>< Your drive buzzes on warm start, (like mine too), because the controller 
>< forgets where the heads are when reset, and must get the heads back to a
>< known place.  Since on the Amiga, the most likely place for the heads to be is
>< 
>
>I doubt it. Two seconds of noise for a simple seek.  Give me a break.  
>These days many drives are rated as having average seek times in the 
>20-60 millisecond range.  An average seek for a drive translates to one 

Don't be so hasty to reject the explanation. What you are referring to by
the 20-60 millisecond range is the *seek* time. What Ethan was referring to
is a completely separate function known as "recalibration", which does not
use a standard seek. This function literally starts and stops the motion of
the head for each track it crosses, resulting in *much* longer times to 
get across the multiple hundreds of tracks on a hard disk. Imagine the time
it would take to do a seek from track 0 to track 599 if you had a 600
track floppy, and you're more in the range of the time it takes to do a 
recalibrate.

>Ray Galvin

Phil

-- 
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Phil Staub                     "I do NOT approve. I merely said I UNDERSTAND."
tektronix!tekigm2!phils                                              - Spock
phils@tekigm2.TEK.COM