[Coco] Read Coco floppies in my PC

[Michael Graham]

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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