Sorry I only got a chance to take a seat in front of my laptop.
I would do the following:
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Backup your pictures collection
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Backup your *.db files (if they are not in the same folder where the pictures collection is)
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Backup digikam settings (search for
"digikamrc"and then open the folder and backup all the configuration files from that folder. If you are on windows 10 it probably won’t find them. I downloaded open sourcedouble commanderand searched from there. -
Copy the collection to the new HDD
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If you are planning on moving the database files to the new HDD and if they are not in the same folder where the pictures collection is move digikam4.db, recognition.db, thumbnails-digikam.db to the new HDD
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Open digikam, if you moved the database files go to to Settings - Configure digiKam - Database and point the new location of the database there.
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Go to Settings - Configure digiKam - Collections - Add collections ( I have never used network locations. I have used local and removable collections and did not see any difference between them). Add the collection on your new HDD
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Click OK, close settings and wait until digiKam finishes adding the new collection.
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Now in the Albums tree on the left side you should have two root folders:
Albums
/your/collection/on/old/hdd
/your/collection/on/NEW/hdd -
Everything will be duplicated. That is fine
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Now you need to do random checks to make sure that pictures you copied to the new HDD contain all the metadata you have entered.
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If you are confident that the items copied to the new HDD contain all the data your had in your database you can go to Settings - Configure digiKam - Collections and remove the collection on the old drive (look for a little trash can icon on the right). This will delete the collection from the digiKam database but it won’t physically delete your pictures.
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That is it. It worked for me few times but again, I write metadata to JPEGs themselves as well as sidecar files for read-only files (RAW images and video files) so my system was more redundant. I actually treat database files as temporary files and deleted them many times and then restored again reading metadata from images (when I was using Windows Live Photo Gallery and Picasa in parallel)