Disk problems/questions.

From: W. Tom Sanderson <wts_at_exo.com>
Date: Sat Feb 14 13:50:30 1998

If I remember correctly, The 1.2M drive uses a track 1/2 the width of the 360K drive. If you format a disk and write data with the same drive, there is no problem. The 1.2 drive can read down the middle of a 360K fat track and all is OK. The 360K drive can read the 1.2M skinny track and all is probably OK. The problem comes in when you use a 1.2M drive to write on a diskette that was previously written by a 360K drive. The skinny track is now on top of the fat track. The 360K drive will certainly have problems. It will read the new data in addition to 1/2 of the old data.


Tom Sanderson
http://exo.com/~wts/wts10005.HTM Virtual Altair Museum

-----Original Message-----
From: Mike Allison [SMTP:mallison_at_konnections.com]
Sent: Thursday, February 12, 1998 9:53 PM
To: Discussion re-collecting of classic computers
Subject: Re: Disk problems/questions.

I had an IBM 360k that I was using, no compliants. I started having
data problems moving stuff from a true 1.2M to the 360. Later, I put a
360 in the other computer and I still had problems. Finally, I figured
it out, the IBM was either out of alignment, or shot...

Could it just simply be the 360k drive?


Barry Peterson wrote:
> On Wed, 11 Feb 1998 07:27:01 -0500, you said:
> >Scandisk works excellent for me here even on my Leading Edge XT. It's
> >something your doing not scandisk.
> Maybe it's a difference between the XT and AT BIOS or how the format
> command is executed, I wasn't "doing" anything but:
> 1) format b:
> (Responding to prompts as appropriate)
> 2)scandisk b:
> (Error message reported by said scandisk program)
> No parameters, no modifiers, nothing more than the above two commands
> _______________
> Barry Peterson bmpete_at_swbell.net
> Husband to Diane, Father to Doug,
> Grandfather to Zoe and Tegan.
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