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Cannot reassign drive letters for external USB flash drives

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Win 7 Ultimate 64-bit, DD 11 Home Build 11.0.2121

Windows has done its usual thing of suddenly and apparently without reason reassigning my flash drive letters (they haven't been removed recently either).

As I use a backup method which relies on the correct drive letters (each flash is different capacity etc.), I wanted to change the letters back to what they were.

This option doesn't appear for these drives in DD, although it does for other SATA devices.

I haven't needed to try to reassign for flash drives, so I'd like to know:-
1) whether DD letter reassign doesn't work for what I'm trying to do by design
2) If it SHOULD work, then what's the problem?

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It would appear that DD 11 won't change the drive letter of flash drives, though I don't know why Acronis would "block" the feature. You should be able to use Disk Management to make the necessary changes.