Disk space usage in df command is not accurate

Solution Verified - Updated -

Issue

  • There is a gap between size of the disk space in df result and specified size at the time of installation. Why?

    # blockdev --getsize64 /dev/sda1
524288000

# df /dev/sda1
Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sda1               495844    186096    284148  40% /boot

  • How much ratio of size is the gap?

Environment

  • Red Hat Enterprise Linux (RHEL), all versions
  • ext2/ext3/ext4 filesystem

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