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Originally Posted by jhowell
The file format version or FFV number was part of the original MOBI format created by Mobipocket and purchased by Amazon. - 0-2 I have never encountered MOBI files with these version numbers.
- 3 Documented as indexes for images
- 4 EXTH, FCIS, FLIS, orthographic index, names index
- 5 RESC, multi-byte overlap trailing bytes in content records (Mobipocket Reader 4.8 - 2005)
- 6 NCX index, multiple flows, non-overlap trailing bytes in content records, DRM V2, always produced by calibre for MOBI
- 7 audio, video, UTF-16 Unicode in indexes, ingestion by kindletool (prcgen/mobigen v5.0, Mobipocket Reader 5 - 2006)
- 8 KF8 based on HTML5 and CSS3
- 9+ No V9 was ever released and KFX (Kindle format 10) is a totally different format
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Excellent. So most refloawable ebooks in .mobi, .prc or .azw (not azw3) are really No. 6, AKA KF6, compatible as there is no audio or video.
I think KFX had two aims: adaptable DRM and less bandwidth / incremental download on so called Whispernet?
The First Kindle was 2007 and Amazon bought Mobipocket in 2005, the year the first Sony eink came out:
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[version] 7 audio, video, UTF-16 Unicode in indexes, ingestion by kindletool (prcgen/mobigen v5.0, Mobipocket Reader 5 - 2006)
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So looks like 7 came out after Amazon bought MobiPocket but during Kindle Development. Hence all Kindles can do version 7 AKA KF7, but probably not doing video sensibly. Also did ALL the Kindles at least to B008 (KK3) and B009 (DXG) have 3.5mm jack audio and even speakers?