Re: Disk Surface Damage
Posted: February 21st, 1985, 11:53 pm
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From: info-mac@uw-beaver
Newsgroups: fa.info-mac
Subject: Re: Disk Surface Damage
Message-ID:
Date: Fri, 25-Jan-85 11:09:14 EST
Article-I.D.: uw-beave.570
Posted: Fri Jan 25 11:09:14 1985
Date-Received: Sun, 27-Jan-85 06:44:49 EST
Sender: daemon@uw-beaver
Organization: U of Washington Computer Science
Lines: 22
From: cornell!vax135!decvax!decwrl!amdcad!fortune![email protected] (Dan Jones)
In article you write:
>From: decvax!ucf-cs!peora!jer@UCB-VAX
>
>On examining the surface of the disk, I found that the disk surface was
>uniformly covered with small, comet-shaped marks. These are about 2 or
>3 millimeters long on the average, although they vary, and are extremely
>narrow. One end (the same end on all the marks) is always widest, with
>the mark tapering off until it disappears at the other end. They resemble
>scratches, except that depending on the angle of the incident light, the
>wide end seems irregular in shape.
>
I don't know anything about MACs, however, if the MAC floppy has a head
load solenoid, your problem would be caused by the head digging into the
disk surface when it is loaded. It is an odd problem and I believe in
any case you have a bad drive. Cleaning the heads might make a difference.
Dan Jones
UUCP: {ihnp4,ucbvax!amd70,hpda,sri-unix,harpo}!fortune!jones
DDD: (415)595-8444 x 440
USPS: Fortune Systems Corp, 101 Twin Dolphin Drive, Redwood City, CA 94065
Posting-Version: version B 2.10.2 9/18/84; site uw-beaver
Path: utzoo!watmath!clyde!burl!ulysses!mhuxr!mhuxj!houxm!vax135!cornell!uw-beaver!info-mac
From: info-mac@uw-beaver
Newsgroups: fa.info-mac
Subject: Re: Disk Surface Damage
Message-ID:
Date: Fri, 25-Jan-85 11:09:14 EST
Article-I.D.: uw-beave.570
Posted: Fri Jan 25 11:09:14 1985
Date-Received: Sun, 27-Jan-85 06:44:49 EST
Sender: daemon@uw-beaver
Organization: U of Washington Computer Science
Lines: 22
From: cornell!vax135!decvax!decwrl!amdcad!fortune![email protected] (Dan Jones)
In article you write:
>From: decvax!ucf-cs!peora!jer@UCB-VAX
>
>On examining the surface of the disk, I found that the disk surface was
>uniformly covered with small, comet-shaped marks. These are about 2 or
>3 millimeters long on the average, although they vary, and are extremely
>narrow. One end (the same end on all the marks) is always widest, with
>the mark tapering off until it disappears at the other end. They resemble
>scratches, except that depending on the angle of the incident light, the
>wide end seems irregular in shape.
>
I don't know anything about MACs, however, if the MAC floppy has a head
load solenoid, your problem would be caused by the head digging into the
disk surface when it is loaded. It is an odd problem and I believe in
any case you have a bad drive. Cleaning the heads might make a difference.
Dan Jones
UUCP: {ihnp4,ucbvax!amd70,hpda,sri-unix,harpo}!fortune!jones
DDD: (415)595-8444 x 440
USPS: Fortune Systems Corp, 101 Twin Dolphin Drive, Redwood City, CA 94065