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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