[Coco] Read Coco floppies in my PC

[Bill]

Mine are Mitsubishi MF504C-318MG drives.

-----Original Message-----
From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] On
Behalf Of Chad H
Sent: Saturday, March 31, 2012 12:15 AM
To: CoCoList for Color Computer Enthusiasts
Subject: Re: [Coco] Read Coco floppies in my PC

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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