Quote:
Originally Posted by chaley
Books are stored as pseudo-BLOBs, but instead of using a real BLOB the book is stored in the filesystem using a computed directory path. This is done (I think) for safety and performance, not to make the files available for processing by external tools.
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From reading very old threads, I believe the earliest versions of calibre stored ebooks as real BLOBs within the calibre database. From what I read, the change to pseudo-BLOBs stored in a computed directory path was made to improve performance.