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Actually a laptop OS can have magically missing space.
Almost OS use a whole number of "blocks" per file. You hope this is an exact multiple of what Flash/SSD or a HDD controller really writes.
Loads of small files (icons, text) will on average waste more space than video for that reason and also the overhead of the directory entries. I've seen that cause a 20% discrepancy between free space and the actual file sizes. Flash writes are FAR faster and Flash lives longer if writes use an exact multiple of the internal block mode access size.
We can't single out Kobo, because ALL gadgety stuff, tablets, laptops etc is sold quoting the headline hardware capacities. The actual free space depending not just on the OS size, but files sizes and filesystem overheads such as block size and directory overhead depending on the chosen partitioning and formatting.
Often a number of music tracks, photos or books is quoted which is less meaningful than quoting initial free space, which I don't remember seeing ever in over 40 years.
Music could be 128 k MP3 or 320 k MP3 or 24 bit uncompressed. Do we count Famous Five & Hardy boys books, Manga, Epic Fantasy or Tolstoy?
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