Thread: Does Kobo use more storage space than Sony
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Old 08-14-2014, 11:54 PM   #4
davidfor
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Posts: 24,905
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Join Date: Jul 2011
Location: Sydney, Australia
Device: Kobo:Touch,Glo, AuraH2O, GloHD,AuraONE, ClaraHD, Libra H2O; tolinoepos
When you put a book on a Kobo device, the following files and other things are created:
  • The actual book is somewhere in the file system
  • Covers - generated from the first page of the book. Up to 4 different sized copies. These are generated as needed.
  • Database records - one row for the book (containing the metadata including the description), two rows for each chapter in the book, one row for each collection the book is in. Exactly how much space depends on the comments in the metadata and the number of chapters, but it shouldn't exceed 100KB. More rows will be added as you read and if you add bookmarks/annotations.
  • ADE files - for epubs and PDF, there are some small files created by the RMSDK. The biggest will contain annotations if you make them.

From what I know about the Sony, it will have all the above, but, I think it uses less copies of the covers and the less database entries. Also, I don't know how big the cover images it has are. I would expect it to use less space for the same book, but not very much.
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