Quote:
Originally Posted by kovidgoyal
The thumbnails are used in the device view in calibre. IIRC the user_metadata was added to support the wifi device connection/calibre companion use case.
I'm somewhat surprised that the old voyage does not have those data. All (reasonably modern) kindles share the same driver as far as I know. And all the kindle drivers delegate the creation of metadata.calibre to usbms/driver.py
I'd like to track down why the old voyage does not have that data available, if possible.
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I speculate that only books sent to the device more recently have thumbnails & user_metadata. More recently than what, I couldn't say off hand.
But I can tell you that out of a library of ~5300 with daily updates, only 238 have thumbnails & user_metadata. That's about a month worth of updates.
Quote:
Originally Posted by kovidgoyal
Rather than a tweak, it is probably better to allow individual device drivers to specify if they need user_metadata or not. Not to mention that a tweak could allow users to exclude arbitrary metadata which can lead to subtle and hard to diagnore bugs.
I'd rather not remove the thumbnails, since as I said they are used by calibre itself, for the covers in the device view.
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Do you have a different suggestion you would accept?
Because I consider a savings of 5 minutes (frequently several times a day) and ~170M of device storage more than worth giving up thumbnails on device and some redundant metadata.