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Why do inode number start from 1 and not 0 ?

Answer Posted / virupakshicm

0 indicates no inode. We know that directory contains data
in the form of entries and each entry contains inode number
and filename. Suppose if we delete a particular file from
the directory, then that entries inode number will be
changed to 0, indicating that this particular entry is
free. So when the next file is created under the directory,
then the kernel uses this entry for the new file and it
also changes the filename component to new name. This is
reason why inode 0 is not used.

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