3.6. Inode data size Each inode contains a count of the number of data blocks that it contains. The number of actual data blocks is the sum of the allocated data blocks and the indirect blocks. Fsck computes the actual number of data blocks and compares that block count against the actual number of blocks the inode claims. If an inode contains an incorrect count fsck prompts the operator to ﬁx it. Each inode contains a thirty-two bit size ﬁeld. The size is the number of data bytes in the ﬁle associated with the inode. The consistency of the byte size ﬁeld is roughly checked by computing from the size ﬁeld the maximum number of blocks that should be associated with the inode, and comparing that expected block count against the actual number of blocks the inode claims.