If a CR500 is disconnected from its power source, does the data logger keep the stored data in the flash memory, or does it erase the data definitively?

The CR500 has battery-backup RAM. If power is lost, final storage data is still retained. When power is restored, final storage data can be accessed. There is 64kB for final storage data grouped in four 16kB sectors. When memory is full, the 16kB sector with the oldest data is completely erased. The new data is stored in that sector.

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