fs Disk Test Type

This attribute is the type of the test to be run. The diskRead test reads every sector on the disk once and reports bad sectors. The filesystemCheck does a sanity check and attempts to repair corruption. The flakyBitDetection test reads every sector on the disk twice and compares the two read results. The surfaceAnalysis test writes a magnetically hard to record pattern to the disk and reads back the pattern to determine the condition of the magnetic surface of the disk. The surface analysis test destroys all the data and disk should be formatted afterward.