Quote:
Originally Posted by thehawkman
So. The way I am doing it is, drag the file to Calibre, click on it -> edit metadata -> download metadata individually -> Click the "download metadata button" -> Accept the proposed covers -> OK -> then "save to disk". Either writing the metadata to the file, or the saving to disk part changes the file.
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The first file is the one I renamed using Calibre. The second is the original.
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Until now you have been claiming that you are simply having calibre rename the file which happens anytime the metadata author or title is changed in the calibre library. Renaming the file does NOT change the size of the file by a single byte.
You are using the Save to disk feature which is more than simply renaming the file. The Save to disk feature exports a book from calibre's library (where the book had already been "renamed" because of the metadata download) and during the export process, embeds the new metadata and often the new cover into the file and will most likely always change the size of the file.
Finally being specific in what you are actually doing clearly exposed what you were not saying previously. And using a specific Title for this thread (Renaming files using "download metadata" changes checksum) which was clearly wrong on its face added to the previous confusion folks had.
Personally I would run a CRC compare tool on my books and delete binary duplicates prior to adding the books to calibre, but that's my way of doing things.
Good Luck with your project.