от 0, а S от 1?
en.wikipedia.org/wiki/Cylinder-head-sector
en.wikipedia.org/wiki/Logical_block_addressing CHS conversion
и как через BIOS добраться за 32 мб?
In the early 2010s, the disk size limitations imposed by MBR became problematic and the GUID Partition Table (GPT) was designed as a replacement; modern computers using UEFI firmware without MBR support no longer use any notions from CHS addressing.
https://en.wikipedia.org/wiki/INT_13H
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