Re: Need an 8280 formatted 8" disk (progress!)

From: Mike Naberezny <>
Date: Wed, 15 Feb 2017 12:01:11 -0800
Message-ID: <>
On 2/15/17 11:20 AM, Bo Zimmerman wrote:
> The disk also has a write-protect tab on the bottom-right of the disk, near
> where the read/write exposure strip is.  Came right out of the damn box that
> way.  Could the write-protect logic on 8" disks be opposite to 5.25"? That is,
> write is enabled when the tab is covered, and disabled when exposed?

Yes.  The write protect notch on 8" disks has the opposite behavior of 5.25" 
disks.  I recently repaired a CGRS Microtech PEDISK II 8" disk system for PET. 
  I had to work through the same issues with the index hole location and write 
protect notch.

Now that my PEDISK II system is working, I can provide a known good 8" single 
sided, soft sectored, single density (FM) formatted disk with 77 tracks, 26 
sectors per track, and a 128 byte sector length.  Disks from my system have 
been successfully read on another.  The filesystem is not be compatible with 
CBM drives but the disk can be used to test sector read and write.


Mike Naberezny (

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Received on 2017-02-15 20:02:04

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