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    You have to assume that data will be lost, so take a back-up first.
    – AFH
    Commented Sep 16, 2017 at 11:51
  • 1
    @AFH how can I make a back up if I can't boot the laptop ?
    – Mahmood Darwish
    Commented Sep 16, 2017 at 11:53
  • Converting is not possible. You have to remove the partition and create a new one. GPT is superior to MBR though, so I would keep GPT. One of the limits of MBR is the maximum size a partition can be. I believe 2 TB is its limit.
    – LPChip
    Commented Sep 16, 2017 at 11:56
  • 2
    It's true that GPT is superior to MBR, therefore many partition layouts cannot be converted to MBR; but some layouts can. Post the result of Linux command gdisk -l /dev/sdX (substitute sdX with your HDD) so we can tell more.
    – Kamil Maciorowski
    Commented Sep 16, 2017 at 18:24
  • 2
    Why do you want to do this conversion? It may not be necessary, and in fact may be quite inadvisable. OTOH, there are some legitimate reasons to want to do this (such as if you want to use the disk with a GPT-unaware OS).
    – Rod Smith
    Commented Sep 24, 2017 at 14:01