HP ac300w User Manual page 32

Note: * Before using Loop recording, you may need to format the
memory card in order to free up enough space.
*Suggest to use memory card more than 4GB.
When the camera is NOT in Loop recording mode, it will record
video until the free memory card capacity is less than 500MB.
The camera will then show "card full". This 500MB space is
default reserved for Looping mode.
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