[Lurbi]

OK

What I ended up using:
NSDPatch instead of patched scsi.device (never tried IDEFix97)
FFS from AmigaOS3.5

I created a biiiiig FFS partition, and it seems to work.

Regarding WHDLoad:
Blocksize of 2k makes my demos crash.
SFS makes my demos crash.

Using NSDPatch and FFS with 512 bytes blocksize seems to have fixed my problems!!

Thanx for your help.
Any further comments are welcome (I am pretty new to amiga ...)

Edit: Small addition:
It seems NSDpatch works only so well, because my CF card is 8GB.
Internal IDE-SCSI device seems to have a 8GB limit ... but I do not hit it, because my HDD is not bigger than 8GB.
For larger HDDs IDEFix can be used! (it replaces the scsi.device instead of patching it.