[Coco] OS9 vs RSDOS disks

[L. Curtis Boyle]

Yes, if you read LSN0, get the sector # that the root directory should start at (make sure it's nothing insane), and then see if the first entries are $2eae and $ae ('..' and '.'), that should be pretty safe.

L. Curtis Boyle
curtisboyle at sasktel.net



On Jun 13, 2013, at 3:57 PM, Retro Canada wrote:

> nope that's not true. if you clean the tracks for the Rsdos directory it will show as an empty disk but yet still a valid os-9 disk. any attempt to write you could ruin it (for os-9 side only).
> 
> the only way is reading and interpreting lsn0 for a valid os-9 geometry.
> 
> 
> 
> 
> Sent from my iPhone
> 
> On 2013-06-13, at 5:32 PM, "George Ramsower" <georgera at gvtc.com> wrote:
> 
>> I forgot to mention that if there is only data or programs on it, you 
>> should boot OS9 and THEN dir the disk. If it's an OS9 disk, you should get 
>> info. Otherwise, it's corrupted or an RSDOS disk.
>> George
>> ----- Original Message ----- 
>> From: Bill Pierce
>> To: coco at maltedmedia.com
>> Sent: Thursday, June 13, 2013 1:29 PM
>> Subject: [Coco] OS9 vs RSDOS disks
>> 
>> 
>> 
>> Hi guys,
>> Is there a simple way to tell an OS9 disk from an RSDOS disk? Maybe 
>> something constant in LSN0 on the OS9 disk?
>> It would be nice to identify the disks through software
>> 
>> Thanks
>> 
>> Bill Pierce
>> My Music from the Tandy/Radio Shack Color Computer 2 & 3
>> https://sites.google.com/site/dabarnstudio/
>> Co-Webmaster of The TRS-80 Color Computer Archive
>> http://www.colorcomputerarchive.com/
>> Co-Contributor, Co-Editor for CocoPedia
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>> 
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