Hi, the kernel is supposed to support all Int21.7304 (Set DPB/BPB fields for formatting) subfunctions but doesn't provide subfunction 03h completely. The current code simply gets (and sets as requested) the flags from the BPB, but doesn't move the FAT accordingly. MS-DOS apparently contains code to do so. This isn't documented in RBIL, but can be tested by setting the active FAT (of a FAT32 drive) to a single one, then resetting the flags to include all FATs later. The second call overwrites the previously inactive FAT(s) with a copy of the active one. (Depending on the size of the file system, this results in a short delay. If this isn't the case, files/directories can be created (changing FAT entries) while only the active FAT is used and dosfsck can be used to insure both FATs have the same content later when the flags were reset.)
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