Why do inode number start from 1 and not 0 ?

Answer Posted / satish

1) All block and inode addresses start at 1. The first
block on the disk is block 1. 0 is used to indicate no
block.
2)0 is used as a sentinel value to indicate null or no
inode. similar to how pointers can be NULL in C. without a
sentinel, you'd need an extra bit to test if an inode in a
struct was set or not.

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