Not sure what's causing this, but if you assign a letter to this drive that's near the end of the alphabet, such as T U V W X Y Z, it will remain at that letter, and you won't have this problem again.
If you are importing images from your external drive and do not wish to create a copy while importing then you can just simply ADD them to your Lightroom catalog.
If you have folders which are meant to be on D drive and accidentally moved to E drive then you can drag and drop the folder from drive E to D from Lightroom itself.
Just select the folder in the Folders panel and drag it into the new destination folder. Lightroom will again ask you if you really want to do that, so click the Move button to proceed.
Thanks for your reply. On the left side Lightroom says I have 1043 missing
photos, which is the number in folders in my E drive. The folders in the E
drive (E drive is named 'CD drive (E): Mobile partner properties' - which
is my dongle) all have question marks (missing?). But they don't seem too
exist anywhere that I can find. Lightroom itself decided to save folders in
the E drive as I definitely made no errors. Is there any way I can find
the missing photos? I don't understand how naming the drive helps? Chris
I forgot to say all of the photos are saved correctly in the destination
folder (the D drive) but on the left hand side of Lightroom some of the
folders are shown in the D drive and some in the E drive - and it all seems
Thanks for your help. I will have a play for a while and see what I can
work out. Cheers, Chris