How to confirm whether the available space on the optical disc media (CD/DVD/.iso file and other) is normal?

Solution Verified - Updated -

Issue

  • Does the available space on a disc have to be 0 after mount?
  • Is it normal to see 0 available/free space of the optical disc media (CD/DVD/.iso file and other) when executing df?
  • Why is the available space after mounting the disc inconsistent with the theoretical calculation?

Environment

  • Red Hat Enterprise Linux
  • Optical Disc media (CD/DVD/.iso file and other)

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