maximum control over your DOS filesystems: Create the boot sector with nasm and have mformat -B (from mtools) fill in the disk geometry. For devices with CHS a

maximum control over your DOS filesystems: Create the boot sector with nasm and have mformat -B (from mtools) fill in the disk geometry. For devices with CHS addressing, information in the BPB is crucial for getting the CHS geometry. It has to match how the medium was formatted.