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Old 02-18-2016, 05:30 AM   #2
pdurrant
The Grand Mouse 高貴的老鼠
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Posts: 74,156
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Join Date: Jul 2007
Location: Norfolk, England
Device: Kindle Oasis
There's an import options in calibre preferences that will cause calibre to discard any imported duplicates. Set that, and then use the standard calibre import, using the root folder of each drive. Calibre will itself search through all the folders for ebook files it can import.
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