[sebhc] Hard-sectored disks

Glenn Roberts gfroberts at comcast.net
Fri Feb 9 06:51:47 CST 2007

i'm not an apple expert but here's the source that says the Apple II used 16 
"hard" sectored disks:


it also (correctly) says that Heath & Northstar used 10 sectored disks.  Of 
course, just because it's on somebody's blog doesn't make it necessarily 

----- Original Message ----- 
From: "Lee Hart" <leeahart at earthlink.net>
To: <sebhc at sebhc.org>
Sent: Thursday, February 08, 2007 11:16 PM
Subject: Re: [sebhc] Hard-sectored disks

> From: Glenn Roberts
>>the Apple II used 16 hole hard sectored disks.  I presume it would at 
>>be a major undertaking to get these to work on Heath hard sectored setups.
>>At a minimum it would seem to require a rewrite of the H17 ROM.
> It did? I always thought Apple II disks were soft sector, though the 
> recorded data format was unusual (not FM or MFM, but rather pulse width 
> encoding).
> Northstar computers used 16-hole hard sectored disks.
> --
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