The memory in the data cache is considered ring memory. This means that after the data cache fills up, new records begin overwriting the oldest records.
CardOut() makes the memory card an extension of the datalogger’s memory. TableFile() uses the memory card simply as a storage medium.
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About External Data Storage Devices
Several types of data storage devices are available from Campbell Scientific. Data storage devices can be used for redundant data storage, additional data storage, or to provide a convenient way to retrieve data from the field site.