Have you ever noticed missing disk space on newly bought hard disks? Here are some possible reasons:
Unit confusion: The most common confusion in between GB/GiB or MB/MiB.
Reserved space in linux partitions.
Filesystem overheads.
Unit Confusion
Many people have questions like: Why my 1 TB hard disk shows only 930 GB? This is purely a confusion of units and bases used when words like 'kilo', 'mega' etc. are used. Following...