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shamanNS · 09-09-2025, 08:39 AM

Check if you're that curios

Conversions to Kindle formats only obviously, other formats don't have / use that ext header...

As far as I recall Calibre started doing that while I still owned a Kindle 3 and used mobi files. That behavior was introduced while you could still have USB transferred ( = not sent and archived on Amazon's servers) non-retail/converted mobis sync last read position between 2 Kindles or Kindle and Kindle app on Android. For sync to work book file needed to have cdeType EBOK and have ASIN field populated (value didn't matter as long as it was unique per book thus GUID was chosen I guess??).

09-09-2025, 08:39 AM	#857
shamanNS Wizard Posts: 1,128 Karma: 12345678 Join Date: Feb 2010 Location: Serbia Device: Kindle PW5, Kobo Libra 2, Kindle PW1	Check if you're that curios Conversions to Kindle formats only obviously, other formats don't have / use that ext header... As far as I recall Calibre started doing that while I still owned a Kindle 3 and used mobi files. That behavior was introduced while you could still have USB transferred ( = not sent and archived on Amazon's servers) non-retail/converted mobis sync last read position between 2 Kindles or Kindle and Kindle app on Android. For sync to work book file needed to have cdeType EBOK and have ASIN field populated (value didn't matter as long as it was unique per book thus GUID was chosen I guess??). Last edited by shamanNS; 09-09-2025 at 08:45 AM.