Re: [hatari-devel] Floppy access on TOS 4.x vs TOS 3.x

[Thomas Huth <th.huth@xxxxxxxxx>]

Am Thu, 10 Jul 2025 23:05:37 +0200
schrieb Miro Kropáček <miro.kropacek@xxxxxxxxx>:

> Hi,
> 
> maybe this is another of those not-so-obvious-until-you-know-about-it
> issues but I have been experiencing this for months now, maybe even years.
> 
> Basically, from time to time I need to create & use a floppy disk image
> (.st) even in Hatari, usually with some drivers or so. For simplicity let's
> assume I already have such an image.
> 
> Now, if I boot TT + TOS 3.06, I can read and execute everything from A:.
> However if I use the same floppy disk image in Falcon + TOS 4.04, I get an
> access error (unable to load file). And what's even stranger, it happens
> only to some files. Retry, switching fast-forward off, fast floppy access
> off... nothing helps. If I switch to TT + TOS 3.06, everything is fine
> again. So it must be something related to Falcon emulation.
> 
> As mentioned, this is not a new issue but seeing this today for like the
> 1000th time I have finally decided to report / ask about it, whether it is
> something known to anybody or whether it is just me again.

 Hi,

I've never seen this issue before (though I really rarely use floppy disks
with Falcon emulation). I just gave it a quick try, but I did not encounter
the issue. Could you maybe provide some more detailed instructions on how to
reproduce the problem?

- How did you create the floppy disk image? Via Hatari's dialog?
- How did you format the floppy (if you did not use Hatari's dialog)?
- What's the geometry of the disk? (single/double sided? HD? Sectors?
  Tracks?)
- Do you have any AUTO start programs or ACCs? If so, could you please
  also try without them?
- Can you give an example on how to create such a floppy, e.g. copy these
  and that contents of a ZIP file to the disk, then it should happen with
  this and that file on the disk...

 Thanks,
  Thomas