MiniTool Partition Wizard is good at helping users convert GPT disk to MBR disk safely.

1. How to Convert GPT Disk to MBR Disk
About “Convert GPT Disk to MBR Disk”
GPT, short for GUID Partition Table, is actually a standard BIOS partition table on a
physical hard disk. Believe it or not, GPT is much better than MBR in many aspects. For
instance, GPT disk supports at most 128 partitions in Windows while MBR disk supports
only 4 primary partitions (or 3 primary partitions and 1 extended partition). No wonder so
many users become fans of GPT disk. But why there are still some users who want
to convert GPT disk to MBR Disk. Please allow us to explain it for you.
Though GPT disk is more advanced when compared to MBR disk, we still need a MBR
disk sometimes. For instance, if users are using a very old operating system like Windows
2000 Server, a GPT disk is not suitable. Even if users employ a GPT disk in Windows
2000 Server, they can’t install operating system to it because the booting from GPT disk is
forbidden in such system. All in all, there are still some situations where we need to
convert GPT disk to MBR disk.
--Source from
http://www.partitionwizard.com/help/Convert-GPT-disk-to-MBR-disk.html
 How to Convert GPT Disk to MBR Disk
For the vast majority of computer users, how to convert GPT disk to MBR disk makes a
very difficult question to them for they are inexperienced in managing the disk. Because of
that, we’d like to introduce an amazing tool – MiniTool Partition Wizard here.
MiniTool Partition Wizard tutorial of “Convert GPT Disk to MBR Disk”:
1.Run MiniTool Partition Wizard and choose the GPT disk which needs conversion in the
main interface.
2.Initialize “Convert GPT Disk to MBR Disk” function through the following three ways:

2.  Click “Convert GPT Disk to MBR Disk” from the “Operations” list on the left side.
 Right click on GPT disk and choose “Convert GPT Disk to MBR Disk” from pop-up
window.
 Click “Disk” in menu bar and choose “Convert GPT Disk to MBR Disk”.

3. 3.Click on “Apply” button in the toolbar (at this time, users can see pending operations at
the bottom of the left action panel).
4.Tap “Yes” button to confirm conversion.
Note: since a MBR disk supports 4 primary partitions at most, Partition Wizard may refuse
to convert the specified GPT disk to MBR if it contains a lot of partitions. At this time, users
need to merge some partitions to continue.