One of the most important on-disk structures of a file system is the inode; virtually all file systems have a structure similar to this. The name inode is short for index node, the historical name given to it in UNIX [RT74] and possibly earlier systems, used because these nodes were originally arranged in an array, and the array indexed into when accessing a particular inode.
I believe this should be "... and the array was indexed into when accessing a particular inode".
First paragraph of 40.3:
I believe this should be "... and the array was indexed into when accessing a particular inode".
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