My 1TB HDD is partitioned (round numbers) into 200GB C: drive, 800GB D: drive. And of course there's a 100MB system partition (SP) at the beginning.
Decided to increase SP to 400MB so decided to move and shrink the D: partition up 300MB; move the C: partition up 300MB, then expand SP by 300MB to 400MB.
For such things Aomei uses what it calls a PreOS function to manipulate things before Windows gets going.
So I set up to do all the changes at once on the reboot. PreOS failed, with a message which read
operation abort - information code 12, disk environment has changed - please reboot.
Rebooted back into Windows.
This time tried the D: partition change on its own, that worked with no reboot needed.
Then tried the C: partition change, reboot needed. The PreOS failed as above. Tried one more time and it still failed. I'd stopped various Start Up functions to minimise Windows activity but that had no affect.
I then created an Aomei WinPE boot disc. Loaded from that. And it then all worked fine.
Thinking about it I'm not entirely surprised that it needed a non-Windows boot to avoid Windows making changes to the C: drive. Perhaps it would be more helpful - assuming my experience is not unusual - for Aomei to advise the use of a boot disc.
Anyway, task done for desktop Win 7 PC, laptop Win 7 yet to do. But at least I have that boot CD now
We have more and more laws, and less and less enforcement