Disruptor wrote on 2025-01-05, 09:32:

Don't create partitions for DOS usage using Windows Vista, 7, 8, 8.1, 10 or 11.
DOS needs classic CHS aligned partition scheme.
Above listed operating systems do not care about compatiblity with CHS.

The partitions were created using FreeDOS. I just copy data to those partitions in Windows 11.

zuldan wrote on 2025-01-05, 07:26:

FDISK on FreeDOS worked perfectly. I now have C: 2GB and D: 1.7GB primary partitions on DOS 6.22 AND Windows 11. Woohoo.

Now that's a surprise!
I always thought that MS-DOS doesn't support more than one primary partition per drive...
but it seems that it can't *CREATE* more than one primary - but if you create them with third-party software, MS-DOS can use them.

How did you format both partitions?
With FreeDOS, or MS-DOS ?

Can MS-DOS tools like CHKDSK or SCANDISK work on both primaries?

Grzyb wrote on 2025-01-05, 10:06:

Now that's a surprise! I always thought that MS-DOS doesn't support more than one primary partition per drive... but it seems th […]
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zuldan wrote on 2025-01-05, 07:26:

FDISK on FreeDOS worked perfectly. I now have C: 2GB and D: 1.7GB primary partitions on DOS 6.22 AND Windows 11. Woohoo.

Now that's a surprise!
I always thought that MS-DOS doesn't support more than one primary partition per drive...
but it seems that it can't *CREATE* more than one primary - but if you create them with third-party software, MS-DOS can use them.

How did you format both partitions?
With FreeDOS, or MS-DOS ?

Can MS-DOS tools like CHKDSK or SCANDISK work on both primaries?

It appears it’s just a limitation of FDISK in DOS v6.22. I formatted the partitions in FreeDOS but I suspect formatting them in DOS v6.22 would work as well. I haven’t tried CHKDSK or SCANDISK yet.

My 4GB CF card setup is also 2GB+2GB done via DOS 6.22 FDisk with Primary+Extended/Logical. Win11 fully recognizes it and I can see both drives in file explorer. The only annoying thing is how Win11 places its trash "System Volume Information" on each drive as soon as I connect the CF card to the Windows machine. I typcially delete it on the DOS machine using Norton Commander.

wbahnassi wrote on 2025-01-05, 14:41:

My 4GB CF card setup is also 2GB+2GB done via DOS 6.22 FDisk with Primary+Extended/Logical.

Yes, that's the official DOS way.

Win11 fully recognizes it and I can see both drives in file explorer.

But that's confusing - looks like Windows 11 isn't consistent here.

The only annoying thing is how Win11 places its trash "System Volume Information" on each drive as soon as I connect the CF card to the Windows machine. I typcially delete it on the DOS machine using Norton Commander.

Yes, the neverending annoyance of Windows - 9x trashes the boot sector with "IHC", modern versions trash the root directory with "System Volume Information".
In both cases it's possible to disable that nasty behavior, but the best idea is to always write-protect any important media...