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Originally Posted by fxp33
This way I could go to 11 700 files at the root of the sdcard. As my filename schema is still longer than the short 8.3 structure, I guess my limit will be around 32000 files instead of the 65000 normal limit of fat32.
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The limit on the number of .epub files per directory is easily solved by creating subdirectories rather than putting them all in the root directory. I use the first letter of the author's surname as the subdirectory name, so even though some letters are more common than others I should be able to load at least 100,000 books before running into limits.
The problem is that the Kobo stores all the cover images and thumbnails created from the books in a single directory, even if the .epub files are in seperate directories. This means that you have three image files per .epub, all in the same directory, and the filnames are very long, which causes the FAT limit on the number of files in the images directory to be reached much earlier than the limit on the number of books.
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Other NOT working solution:
1) tried to format as exfat (fat64) : not recognised.
A pity because this way I could have kept the long filenames.
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I read somewhere here that a linux ext2/3/4 filesystem would work, apparantly the Kobo can use it, and it doesn't have the limits of FAT filesystems. I haven't tried it yet but might if Kobo haven't come up with a better way to store the images before I run into the FAT directory limits.