Answer :
When creating an ext2 or ext3 file system, a fixed number of inodes is assigned, df -i shows the number of inodes, number of free inodes, and number of used inodes.
What is inodes?
Since the first UNIXThe Linux penguin file system was released in the late 1970s, there have been inodes, which are rumoured to be short for "index nodes."
In the 1990s, Linux adopted them, and for good reason. They are the approach that many systems are still based on today and are an excellent way to keep track of how your files are stored.
Fixed-size blocks of data are placed on your disc for storage. Your computer will locate the next available segment to store the remaining portion of your file if you save a file that is larger than a typical block. That can become very perplexing over time.
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