Actually I have ubuntu 16.04 in single boot but considering I'll have to install windiows 7 to be dual boot for work purposes , I could make a space for it using GParted but how can I format that space as MBR I can't find a way even googling it any help please ?
gdisk has a
h command that creates an MBR along with an existing GPT:
h Create a hybrid MBR. This is an ugly workaround that enables GPT-unaware OSes, or those that can't boot from a GPT disk, to access up to three of the partitions on the disk by creating MBR entries for them. Note that these hybrid MBR entries can easily go out of sync with the GPT entries, particularly when hybrid-unaware GPT utilities are used to edit the disk. Thus, you may need to recreate the hybrid MBR if you use such tools. Unlike the 'g' option, this option does not support converting any partitions into MBR logical partitions.
- the GPT prevails and the MBR is just an image which must be updated each time the GPT changes.
- the MBR won't be created from an incompatible GPT (partitions too large, too many partitions, etc)
- use it with caution! Backup your data before fiddling with the disc partitions