Sony VAIO VGN-NS - Manual (Page 39)

39 n N
Using Your VAIO Computer
4 Close the drive tray by pushing it in gently.
!
Do not remove the optical disc when your computer is in a power saving mode (Sleep or Hibernate). Doing so may cause the computer to malfunction.
✍
If you plan to use an external optical disc drive, connect the drive before you launch any preinstalled disc operation program.