[Coco] Read Coco floppies in my PC

[Michael Graham]

Whoops, accidental send.

My 1.2mb drive is a Teac FD-55GFR.  I was using IBM DOS 5.0.

On 3/30/2012 11:15 PM, Michael Graham wrote:
> On 3/30/2012 10:14 PM, Chad H wrote:
>> What OS are you using?  What 1.b drive model?   Only time I get 
>> errors on good media in my 98 box is when I mess upand try to format 
>> a 360k disk as 1.2mb
>>
>> Michael Graham<mkgraham at gmx.com>  wrote:
>>
>>> I'm not sure how you pulled that off.  When I write with my 1.2mb drive
>>> (with format /f:360), I always get 'Sector not found' errors reading
>>> them with a 360k drive.  The other way around works, though, at least
>>> until I write to the disk with the 1.2mb drive, then the disk becomes
>>> unreadable.  I'm pretty sure it has to do with the fact that a 1.2mb
>>> drive head writes narrower tracks than a 360k drive.  I originally 
>>> would
>>> have thought it was just something wrong with my drive, but I did a web
>>> search after noticing this and found other accounts and an explanation
>>> on a couple of websites.
>>>
>>> The same thing happens when I format a 720k floppy in a 1.44mb drive.
>>> The 1.44mb drive can read it, but a true 720k drive cannot.  That's why
>>> I have a 1.44mb drive hooked up to my PCjr as a second drive, even
>>> though I can only use it in 720k mode;  It makes file transfer much
>>> easier if I don't have to also write with a 720k drive.
>>>
>>> On 3/30/2012 9:53 PM, Chad H wrote:
>>>> I have 9 360k pc-xt drives, all fully tested to read/write disks 
>>>> formatted by 1.2 mb drives without problems....?????
>>>>
>>>> Michael Graham<mkgraham at gmx.com>   wrote:
>>>>
>>>>> Just FYI, most double-density (360k) drives won't read double-density
>>>>> disks written on high-density (1.2M) drives.  I tried this when I 
>>>>> first
>>>>> got my PCjr, and it didn't work, so I had to swap the 360k drive back
>>>>> and forth between my PCjr and my old desktop machine until I could
>>>>> source another 360k drive.  I couldn't get disks written in a 1.2M 
>>>>> drive
>>>>> to read on my CoCo, either.  However, disks written with a 360k drive
>>>>> will read back just fine on a 1.2M drive, as long as you don't try to
>>>>> write to them.
>>>>>
>>>>> On 3/30/2012 8:20 PM, Bill wrote:
>>>>>> The drives I just got are 1.2Mb, and I have tried several times 
>>>>>> to format a
>>>>>> 360K disk, but for some reason it won't let me. I type in the 
>>>>>> command format
>>>>>> b: /f:360 (which SHOULD work), but it gives me an error message.
>>>>>>
>>>>>> Has ANYONE been successful formatting a 360K disk in XP with a  
>>>>>> 1.2Mb drive?
>>>>>>
>>>>>> Thanks
>>>>>>
>>>>>>
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>
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