Path: utzoo!utgpu!news-server.csri.toronto.edu!clyde.concordia.ca!uunet!crdgw1!sixhub!davidsen
From: davidsen@sixhub.UUCP (Wm E. Davidsen Jr)
Newsgroups: comp.unix.xenix
Subject: Re: Perstor Disk Drive Controllers
Keywords: disk drive controllers,experiences requested,how?
Message-ID: <614@sixhub.UUCP>
Date: 13 Mar 90 19:47:02 GMT
References: <868@edstip.EDS.COM> <24@psmsd.UUCP>
Reply-To: davidsen@sixhub.UUCP (bill davidsen)
Distribution: na
Organization: *IX Public Access UNIX, Schenectady NY
Lines: 20

In article <24@psmsd.UUCP> pmartin@psmsd.UUCP (Paul Martin) writes:

|                                                      The only caution I
| have is make sure that your case for the drive has good ventilation.
| The perstor will cause your drive to get hotter than normal thus causing
| a failure.  This is because the drive spins faster under the perstor.

  Trust me, that's not how it works. Any form of RLL does not "make the
drive spin faster" not does it "put the bits closer together." It gets
compression by putting the bits farther apart and measuring the distance
between them more closely.

  A drive which is marginal MFM may be unusable RLL when it gets a
little hotter than normal, but NOT because it's spinning faster. The
drive spins even with no controller at all.
-- 
bill davidsen - davidsen@sixhub.uucp (uunet!crdgw1!sixhub!davidsen)
    sysop *IX BBS and Public Access UNIX
    moderator of comp.binaries.ibm.pc
"Getting old is bad, but it beats the hell out of the alternative" -anon