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Move internal laptop disk to external caddy and still boot from it

CEHJ
CEHJ asked
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I wonder if this is possible? It certainly didn't work when i tried it, having moved the SATA system disk to a USB3 caddy. It tried to boot, the disk having been seen by the BIOS, but clearly something wasn't happy as it went into a never-ending repair cycle. Is there a way to make it happy perhaps?

I tried to google this but all i found was irrelevant stuff about cloning and copying.
GOAL: keep WIndows 7 available and install a different OS on a small, new (internal) SSD.
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Distinguished Expert 2019
Commented:

windows 7 won't boot from USB3 only USB2

Distinguished Expert 2019

Commented:
neither does windows 10 afaik -
you may want to read this :  https://www.easeus.com/todo-backup-resource/run-windows-10-from-usb.html

***may i ask what you want to achieve with this ?
Top Expert 2016

Author

Commented:
windows 7 won't boot from USB3 only USB2
Right. I suspected that might be the case

***may i ask what you want to achieve with this ?
Just keeping the old OS on an external drive in case he needs to boot from it

As it happens, a fresh installation of WIn 10 is now the requirement but thanks folks
Top Expert 2016

Author

Commented:
Thanks