Real mode BIOS routine and Protected Mode

Question

I am doing some OS experiment. Until now, all my code utilized the real mode BIOS interrupt to manipulate hard disk and floppy. But once my code enabled the Protect Mode of the

Answer 1

If you're writing an operating system, it really needs to have device drivers for any hardware it needs to use, including the storage devices. If you want to avoid needing drivers at such an early stage, you could consider using an existing bootloader like grub, but eventually you'll need them anyway.