06-24-2013, 09:55 PM
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#3
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BLAM!
Posts: 13,506
Karma: 26047202
Join Date: Jun 2010
Location: Paris, France
Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E
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Look at the Calibre Kindle Collections plugin for more details, but, in short:
Starts with a star: SHA1 checksum of the absolute path of the file on the device
Starts with a hash: ASIN^cdeType (both come from the MOBI header)
(And, you guessed it, the SHA1 way is the fallback [it's a legacy remnant of how it was first handled in FW 2.5] when there's not enough metadata support in the fie format (ie. PDF)).
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