Sony MSW-900 Operation Manual page 131

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 memory
content has been lost.
Adjust the black balance again. Contact your Sony representative if this
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message continues to appear even after the black balance has been
adjusted again.
For more information, refer to the Maintenance Manual.
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Chapter 4 Adjustments and Settings for Recording