1. This forum section is a read-only archive which contains old newsgroup posts. If you wish to post a query, please do so in one of our main forum sections (here). This way you will get a faster, better response from the members on Motherboard Point.

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

Discussion in 'Embedded' started by Juergen Marquardt, Sep 6, 2004.

  1. 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 Marquardt, Sep 6, 2004
    1. Advertisements

  2. Juergen Marquardt

    Sergio Masci Guest

    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

    Sergio Masci

    http://www.xcprod.com/titan/XCSB - optimising PIC compiler
    Sergio Masci, Sep 6, 2004
    1. Advertisements

  3. disc. Yes there are checks to prevent the BIOS loading and executing
    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.
    Lewin A.R.W. Edwards, Sep 6, 2004
    1. Advertisements

Ask a Question

Want to reply to this thread or ask your own question?

You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.