Article View: comp.sys.mac
Article #10678Re: SE/30 with (bad) 40mb disk
From: Philip Machanick
Date: Mon, 19 Mar 1990 18:18
Date: Mon, 19 Mar 1990 18:18
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In article <22519.2602bdeb@kuhub.cc.ukans.edu>,
kudlacek@kuhub.cc.ukans.edu writes:
> The actual problem was that these drives were sticking and not
> getting enough torque at startup to move the heads... The ROM fix
> increases a voltage (or current?) to give the stepper motor more
> uumph. Additionally, the ROM invokes a periodic head sweep during
^^^^^^^^^^^^^^^^^^^
> normal operation to keep the lubricant slippery. Neat idea huh!
I've often wondered why my Mac would every now and then do a disk access
when it was supposed to be idle. Could this be the reason (I'm not only talking
about Apple HDs here: I've also had this with a Quantum 105M).
Philip Machanick
philip@pescadero.stanford.edu
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<1990Mar19.181842.15306@Neon.Stanford.EDU>Path:
arc1-ca.pugleaf.net!utzoo!attcan!uunet!cs.utexas.edu!uwm.edu!bionet!ames!sun-barr!decwrl!shelby!neon!Kermit.Stanford.EDU!philipReferences:
<22519.2602bdeb@kuhub.cc.ukans.edu> <1990Mar15.145401.17551@aucs.uucp>Show Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!cs.utexas.edu!uwm.edu!bionet!ames!sun-barr!decwrl!shelby!neon!Kermit.Stanford.EDU!philip From: philip@Kermit.Stanford.EDU (Philip Machanick) Newsgroups: comp.sys.mac,comp.sys.mac.hardware Subject: Re: SE/30 with (bad) 40mb disk Message-ID: <1990Mar19.181842.15306@Neon.Stanford.EDU> Date: 19 Mar 90 18:18:42 GMT References: <22519.2602bdeb@kuhub.cc.ukans.edu> <1990Mar15.145401.17551@aucs.uucp> Sender: news@Neon.Stanford.EDU (USENET News System) Reply-To: philip@pescadero.stanford.edu Distribution: na Organization: Computer Science Department, Stanford University Lines: 16