DOS/32 Advanced DOS Extender - Programmer's Reference
3.03 - DOS function 1Bh - Get Default Drive Info
||AH = 1Bh
||AL = sectors per cluster
ECX = bytes per sector
EDX = total number of clusters on drive
DS:EBX = pointer to media ID byte
a) The selector returned in DS register will be zero selector, ie readable/writeable data selector with Base=0. This is an internal to DOS/32 Advanced selector which may NOT be freed or modified under any circumstances.
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