Not entirely true -- this is the case if the drive is configured as "Enhanced" or "RAID" or "AHCI" in the BIOS/EFI. There's typically a "Legacy" mode which will

Not entirely true -- this is the case if the drive is configured as "Enhanced" or "RAID" or "AHCI" in the BIOS/EFI. There's typically a "Legacy" mode which will make the device visible to DOS (and indistinguishable from any other ATA controller).