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...t checking for presence (ah=41). memdisk doesn't implement those (#2). Workaround for #1: only hand reset calls down to the original handler if it is meant for hard disks, too (high bit in dl set). i added the following lines to the Reset code: Reset: TRACER 'R' test dl,80h jnz .passon xor ax,ax ret .passon: [ original Reset code here ] Workaround for #2: I implemented the int13 ah=41,42,43,44,47 and 48 functions (not well tested, though!). If someone is interested in those, i could post the patch. cheers, robert