Sony HANDYCAM DCR-SX45 Operating Manual page 54

The memory card is damaged. Format the
memory card with your camcorder (p. 49).
Incompatible memory card is inserted (p. 20).

Access to the memory card was restricted on
another device.
The camcorder is unsteady. Hold the camcorder
steady with both hands. However, note that
the camera-shake warning indicator does not
disappear.
The recording media is full. Delete unnecessary
images (p. 31).
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54