What is the difference between “Size” and “Size on disk?”
In: Technology
In a really simplified sense: think of a storage device as a book: storage is divided logically into discrete “pages”. Each page can only be assigned to a single file, so if that file doesn’t occupy the entire page, the rest can’t be used by anything else since the table of contents points to that page for the first file.
This is why, especially notable for a small file, the “size on disk” statistic is often a even multiple of a power of 2 (like 4kb, for example”)
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