Campbell Scientific CR6 CR6 Measurement and Control System - Page 488
Data Recovery
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Section 10. Troubleshooting 10.9 Data Recovery In rare circumstances, exceptional efforts may be required to recover data that are otherwise lost to conventional data-collection methods. Circumstances may include the following: • Program control error o A CRBasic program was sent to the CR6 without specifying that it run on power-up. This is most likely to occur only while using the Compile, Save and Send feature of older versions of CRBasic Editor. o A new program (even the same program) was inadvertently sent to the CR6 through the Connect client or Set Up client in LoggerNet. o The program was stopped through datalogger support software File Control or LoggerLink software. • The CPU: drive was inadvertently formated. • A network peripheral (NL115, NL120, NL200, or NL240) was added to the CR6 when there was previously no network peripheral, and so forced the CR6 to reallocate memory. • A hardware failure, such as memory corruption, occurred. • Inserting or removing memory cards will generally do nothing to cause the CR6 to miss data. These events affect table definitions because they can affect table size allocations, but they will not create a situation where data recovery is necessary. Data can usually be recovered using the Datalogger Data Recovery wizard available in DevConfig (p. 116). Recovery is possible because data in memory is not usually destroyed, only lost track of. So, the wizard recovers "data" from the entire memory, whether or not that memory has been written to, or written to recently. Once you have run through the recovery procedure, consider the following: If a CRD: drive (memory card) or a USB: drive (Campbell Scientific mass storage device) has been removed since the data was originally stored, then the Datalogger Data Recovery is run, the memory pointer will likely be in the wrong location, so the recovered data will be corrupted. If this is the case, put the CRD: or USB: drive back in place and re-run the Datalogger Data Recovery wizard before restarting the CRBasic program. In any case, even when the recovery runs properly, the result will be that good data is recovered mixed with sections of empty or old junk. With the entire data dump in one file, you can sort through the good and the bad. 488
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