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Direct Access: Software communicates directly with the hard disk controller and then communicates with the hard disk.
Accessing the hard disk directly is the fastest way to get data to and from the disk, but it requires the software to know quite a bit about the hardware.
Software Access needs to know how to address the controller and how to issue commands to it.
The BIOS works as a middleman between the software and the hard disk
When the BIOS is used, there is a risk that it may return incorrect information about the disk.
If BIOS thinks it is an 8 GB, but the disk is really 12 GB, the INT 13h function provides access to only the first 8 GB.
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