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How to make GPT volume bootable
I'm not sure the history is too helpful as the question says it all, but here it is.
On an Acer predator G3-605 I had a mSATA 60GB SSD as system disk that was too small. I bought a larger replacement and used Acronis True Image 2019 to clone it. The clone was successful in that the files all appear to be copied, but when examined using Disk Management I see that the disk is not shown as Active, Bootable.
Although I am certain that I at no time cloned from larger disk to smaller, neither disk now is bootable ! And the O&O image I took before I started this also, when used to restore from, produces a disk that is not bootable. Baffled.
Reinstalling Windows then restoring all documents and reinstalling all programs is clearly one way forward, but I just want something like DISKPART ACTIVE that would remedy the problem. I don't know enough to know why there is no such command (as far as I know) for GPT disks.