1.   It is particularly useful when the storage disks become full, or if a certain package does not need to be stored online.

2.   Much will be lost, but even where disks become unreadable they may well contain information which is ultimately recoverable.

3.   After that, the disk would become unplayable.

4.   Digital video disks could become a universal storage medium, working in computers, music machines and video games.

5.   The disk has become a staple for video demonstrations, and somehow the familiar clips remain as fresh as wind in your face.

6.   Your old disk will become the weak link in the chain, slowing your computer down.

7.   Eventually, the disk becomes dense enough at its core to ignite the nuclear fires that power stars.