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The C language convention counts array indices from 0.
Why does GRUB count from 0?
Why does hard disk device numbering start with "a" and "1"?
Seriously---there are many kinds of computer utilities and conventions--there is no standard that says that numbering should start with 0 or 1. Unfortunately, you simply have to remember what convetion is followed for each situation.
Many Linux and Unix systems actually use inode numbers now that are random.
That might be true of a particular filesystem. But on Linux filesystems at least, many of the inode numbering schemes are simply an incrementing counter (exceptions including things like the implementation of FAT). The inode number does get hashed for lookup purposes.
Last edited by neonsignal; 01-07-2010 at 06:34 AM.