Windows 7 Thread, Convert GPT to MBR in Technical; I have got 3 Acer Laptops that came with Windows 7 & 8. We want them running Windows 7 so ...
1st October 2013, 03:33 PM #1
Convert GPT to MBR
I have got 3 Acer Laptops that came with Windows 7 & 8. We want them running Windows 7 so we can run TrueCrpyt. Truecrpt doesn’t work on drives that have a GUID Partition Table (GPT). So I found that I can do a DISKPART and remove all the partitions and convert to MBR. The drive shows has not being GPT. The bios is set to legacy boot. When I try installing Windows 7, I get “Windows cannot install to this disk. The selected disk has an MBR partition table. On EFI systems, Windows can only be installed to GPT disks.”
Anyone got any ideas on what to do?
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1st October 2013, 06:29 PM #2
How big is the disk also try setting the hard drive to either compatibility or apci and see what that does
1st October 2013, 10:02 PM #3
From what you've described, you have successfully converted the disk to MBR. However, you now need to switch off EFI in the BIOS. It's currently switched on and that's why Windows is complaining.
2nd October 2013, 10:30 AM #4
@kevin_lane The disk in only 500GB
Originally Posted by kevin_lane
@AngryTechnician I can only find UEFI in the Boot Mode in the BIOS. I have got that set yo Legacy BIOS.
Originally Posted by AngryTechnician
2nd October 2013, 10:57 AM #5
Its due to the Windows Installation - When you install it on a GPT it reconfigures for the dynamic disk etc. I do believe you will have to reinstall Windows.
(This happened to me using Windows 8, I had a perfectly good MBR and it changed it to damm GPT!)
2nd October 2013, 12:29 PM #6
@SovietRussia I am reinstalling Windows on it.
Originally Posted by SovietRussia
It seems like I get the drive to be MBR when using DISKPART but as soon as I install Windows 7, the drive goings to GPT. Its driving me mad! lol!
2nd October 2013, 05:28 PM #7
Strange because you should only use gpt with drives over 2TB I believe
2nd October 2013, 05:31 PM #8
As you can imagine, its driving me mad. It came with Windows 7 & Windows 8. So we went for Win7 but couldn't use Truecrpyt because of the GPT. So I thought I'd remove all partitions & convert to MBR using DISKPART and then install Win 7 again after I had changed the BIOS to Legacy BIOS and it would work.. It installs but its still GPT!
Originally Posted by kevin_lane
2nd October 2013, 05:45 PM #9
Sounds daft, but if you're installing from DVD, is the DVD drive in EFI mode in the BIOS? If so, try changing it to Legacy/SATA mode and try to install again.
Apparently some BIOS will try to boot from DVD in both modes; if yours is doing that the "press any key to boot from DVD" will appear twice, try waiting for the second time then pressing a key
2nd October 2013, 06:16 PM #10
try using a linux disk to kill the partitions
2nd October 2013, 07:24 PM #11
Diskpart from what 7 or 8? I assume the drive shows up in diskpart on 7? You may still need to add the controller driver though.
3rd October 2013, 10:35 AM #12
@sted Is there any Linux disk you would recommend? I am not good with Linux!
Originally Posted by sted
3rd October 2013, 10:37 AM #13
3rd October 2013, 10:38 AM #14
@DMcCoy I used DISKPART from Windows 7. It was done by going pressing Shift F10 for the CMD when the Windows install starts
Originally Posted by DMcCoy
3rd October 2013, 10:44 AM #15
for deleting drive partitions pick one it will probably make 0 difference you arnt installing the os just using its disk tools from the install media
Originally Posted by stevehill06
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