=> R0 = 24 (reason code)
R1 = pointer to filename
<= R2 = natural block size in bytes
This call allows you to find the natural block size of a given file. When you create or extend a file, disc space can only be allocated in chunks of a minimum size (512 bytes, for example). If your file is just 1 byte long for example, 511 bytes of disc space may have to be wasted after it if the natural block size is 512.
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