Windows 10: Help with changing active partition

When I did diskpart as described above, and wrote ACTIVE instead of INACTIVE, I got an error message saying : "The selected disk is not a Fixed MBR disk. The ACTIVE command can only be used on Fixed MBR disks." What can I do now ?

 

1. Start your own thread.

2. The drive is GPT partitioned. An active partition is only required to create a partition that a legacy BIOS (or UEFI in CSM mode) can boot from on an MBR partitioned hard drive. So, the question is, do you have a legacy BIOS computer that you need to boot from this drive? That would be the only reason to have an active partition on a hard drive. If your computer is UEFI, then you create a FAT32 EFI System Partition instead, which does not need to be marked active.

3. If you do have a legacy BIOS computer that you need to boot from this hard drive, then you need to convert it from GPT partitioning to MBR partitioning.

 

Or just delete the drive to unallocated space during the install.

Unplug ALL other drives.

 

1. The drive started by having undeletable partitions. I seemed to have fixed that by doing the appropriate steps in diskpart.
2. I know the terms MBR and GPT and have even heard of UEFI and EFI, but not CSM. However that is the limit of my familiarity with them.
3. The PC from which I cloned the O/S, and in which I want to test whether cloning was successful, does NOT allow for hot-plugging of HDDs, so I suspect that makes it a legacy PC. The 1TB HDD is destined to run in a not-new laptop.
4. I did the exact same procedure to a 80Gb SATA HDD, and I could mark the partition as active, and it did boot that legacy PC.
5 Where/how do I find the option to convert a GPS to an MBR partitioning system ?
6.I have NO intention of re-installing the O/S

 

How to free convert GPT disk to MBR disk without any data loss?

 

That was a link to follow.

 

I'm sure it was intended to be, but I did NOT get a link. I will be away until tomorrow and can no longer follow this today.