Hi Bernd, I am not sure whether the boot sector should get a special treatment either. In any case, I would only do media_check if the I/O free get_dpb has failed. Also, I think the kernel tries to init all drive DPB and CDS data at boot. If this would work, you would not have to do this check in int 25 / 26. On the other hand, floppies are special, as they can be taken out of the drive and changed etc. :-p Makes me wonder which strategies other DOSes use. Regards, Eric
The handler does not check if sector zero has to be read / written. But I think it should, and bypass the check for FAT32 etc, as access to sector zero probably means reading / writing a new BPB. As a test I altered the handler to call media_check() if sector to be read / written is NOT sector zero, and bypass the FAT32 check for sector zero. Has fixed the problem for me. I am not sure if it is a good idea to call the media_check() for all INT25,26 calls, as this should result in an additional driver call for every INT25,26. [1]: https://github.com/FDOS/kernel/blob/654e7b7a6c244c81ff8ef1d39a5fb07608e3d07a/kernel/inthndlr.c#L1809
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