Cloned drive not behaving the same as original

[Taserx]

I have a Macbook for which I wanted to make a backup in case something ever happened to the drive.

I took the drive out of the macbook and made an exact clone of the drive using ddrescue to a brand new drive of the same size.

I tried putting the cloned drive into the macbook and it wouldn't recognise it. I hooked it up to a windows computer (which has software installed to read HFS+ volumes), and it said the volume was not allocated in Disk Management. When I connect the original drive it can see the partitions in Disk Management no problem.

When I scanned the drive using data recovery software, it picks up the partitions just fine so I know the clone worked.

Is there any reason why a perfect clone would behave differently in this situation? The original is a HGST and the new drive was a Western Digital, but both exact same number of LBAs. Could the fact they are different brands be causing an issue?

Cheers for any advice

[F_ARG]

Hi Taserx! You can try opening the first sector of both drives with an hex editor and check if they are exactly the same.

Best,

F.

[Taserx]

Ok I'll give that a go. But ddrescue reported 0 errors so I don't understand how they could be different if they are.

[F_ARG]

Ok I'll give that a go. But ddrescue reported 0 errors so I don't understand how they could be different if they are.

Me neither , but i think it is a good way to start figuring it out.

Best!

F