Xoo Posted February 4 Share Posted February 4 Not that I'm planning to do this anytime soon, but just thinking about things. I'm in what seems like an unusual system configuration and so don't know what would actually happen. Windows 10 Hardware supports TPM and CPU is "compatible" so Windows 11 will work on it - TPM currently disabled Leagcy/CSM BIOS so no UEFI Drives are not formatted using GPT If I enabled TPM and UEFI and tried to run the Windows 11 update, what would happen? Would the installer convert the partitions to GPT successfully? Or what would happen? I know I could take a copy (Macrium) of drives and try it, but it'll take time no matter what (and time is very precious here!) especially if I need to restore the system from backups. Anyone any idea? Link to comment Share on other sites More sharing options...
msmcleod Posted February 4 Share Posted February 4 Converting from MBT to GPT for an upgrade is a major PITA. I had this issue when changing from an MBT formatted 2TB drive to a 4TB drive (which needs GPT to access all 4TB). The way I did it... 1. Use Clonezilla to backup my original OS partition on the 2TB drive as an image to a backup HDD 2. Format the 4TB drive, and install a clean Windows OS - and don't activate it 3. Use PartitionWizard to partition the 4TB drive, reducing my new OS partition to around 64GB, a new partition large enough for restoring the old OS partition, and another partition for data. 4. Use Clonezilla to restore the old OS image to the new partition on the 4TB drive. 5. Boot up the 4TB drive - this boots into the new OS on the 64GB partition 6. Set up a dual boot, so I can boot either partition 7. Boot into the old OS, and set it as the default boot. 8. Remove the dual boot leaving only my original OS as the default boot 9. Finally, erase the 64GB partition - I think I added it to the data partition in the end using PartitionWizard. Steps 6,7 & 8 are the trickiest. You need to use command line tools... so read the MS documentation carefully. Link to comment Share on other sites More sharing options...
Xoo Posted February 4 Author Share Posted February 4 1 hour ago, msmcleod said: Converting from MBT to GPT for an upgrade is a major PITA. That's what I thought - I tried it before (manually) and had to reverse out. I was hoping Windows might be better than me at doing it! That sounds messy, but I think I can see how it works at least. Where does GPTing the old OS partition happen? I'd have thought using CloneZilla to restore would have kept it in MBR format, no? Link to comment Share on other sites More sharing options...
msmcleod Posted February 4 Share Posted February 4 1 hour ago, Xoo said: That's what I thought - I tried it before (manually) and had to reverse out. I was hoping Windows might be better than me at doing it! That sounds messy, but I think I can see how it works at least. Where does GPTing the old OS partition happen? I'd have thought using CloneZilla to restore would have kept it in MBR format, no? The GPT / MBR is basically the disk's index of what partitions are contained within the disk, so you format the new disk as GPT. I used Clonezilla to backup/restore the old OS partition, not the entire disk. Link to comment Share on other sites More sharing options...
Xoo Posted February 4 Author Share Posted February 4 Ah. Ta. Link to comment Share on other sites More sharing options...
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