Number of FAQs related to External Data Storage Devices: 2
By default, the datalogger's final-data memory (that is, memory for stored data) is organized as ring memory. With ring memory, the new data is stored, which then overwrites the oldest data. This means that after a table fills up, new records begin overwriting the oldest records. Each table is its own ring.
Ring memory also applies to the software data cache in LoggerNet, PC400, and PC200W.
CardOut() makes the memory card an extension of the datalogger’s memory. TableFile() uses the memory card simply as a storage medium.