On an unconditional format I always command: Format A: /F:1440 /U - but I
still get the error way too often.

On Tue, Jun 2, 2015 at 10:59 AM, Don Flowers <donr...@gmail.com> wrote:

> I have gotten that critical error so often that I have abandoned FreeDOS
> format. It happens most often on previously unformatted diskettes or on
> 720kb diskettes.
>
> On Tue, Jun 2, 2015 at 10:55 AM, John Hupp <free...@prpcompany.com> wrote:
>
>> In the thread "Drivers or tips for 3 ISA sound cards?" I just reported
>> solving a problem with a driver installer that froze when it arrived at
>> the step where it analyzes the hardware configuration.  It turned out
>> that it was choking on the fact that D: and E: partitions existed but
>> were not yet formatted.  The installer worked fine once I formatted the
>> partitions.
>>
>> I then wondered if that same circumstance played into another quirk I
>> had observed.  I had been unable to make this work on this machine:
>>  > format a: /u
>>
>> That always produced an error.  My notes are a bit scattered, and I'm
>> not 100% sure that this is the error connected to that command, but I
>> think it was:
>>
>> Critical error during DOS disk access
>> DOS driver error (hex): 01
>>      Description: unknown unit for driver
>> Program terminated
>> [Error 129]
>>
>> But after formatting the two partitions, "format a: /u" seems to work
>> fine.
>>
>> This was not a fully controlled test, and I'd like to have the
>> opportunity/time to test it more definitively, but I'm reporting this to
>> see if anyone else can confirm or deny the behavior.  This is a default
>> FreeDOS 1.1 installation on a Pentium 150, 64MB configuration.
>>
>>
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>
>
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