Any check of MBR, Boot Sector a.s.o. at boot time?

Do you have a question? Post it now! No Registration Necessary

Translate This Thread From English to

Threaded View
Does a normal PC (the BIOS) do any checks of MBR, boot sector and boot files
at boot time?
Are there any checksums ?
Are there differences between FAT-12, FAT-16, FAT-32 and NTFS?
Juergen



Re: Any check of MBR, Boot Sector a.s.o. at boot time?

Quoted text here. Click to load it
files

The boot sector is loaded by the BIOS. The BIOS does not know about file
systems (FAT, NTFS etc). The code in the boot sector is responsible for
loading the rest of the bootloader and knows about the file system on the
disc. Yes there are checks to prevent the BIOS loading and executing
garbage.

Regards
Sergio Masci

http://www.xcprod.com/titan/XCSB - optimising PIC compiler



Re: Any check of MBR, Boot Sector a.s.o. at boot time?
Quoted text here. Click to load it

Not much of a check, though - just looking for two bytes set to a magic
value! The BIOS _ALSO_ knows nothing of the MBR structure except for
those two blessed bytes that indicate a "bootable" disk.

Site Timeline