Sony HDW-730 Operation Manual page 141

Black balance memory
Values stored in memory are held until the black balance is next
adjusted.
If a memory error occurs
If the error message ": STORED DATA : NG" flashes on the viewfinder
screen when the camcorder is turned on, the black balance and white
balance memory contents have been lost.
Adjust the black balance and white balance again. Contact your Sony
4
representative if this message continues to appear even after the black
balance and white balance have been adjusted again.
For more information, refer to "Maintenance Manual."
4-5
Chapter 4 Adjustments and Settings for Recording