This proves that WD Data Lifeguard Diagnostics cannot be relied upon when it reports that the drive is perfectly healthy. A third party tool however confirms that the drive has logged the problem in its SMART records.There are no 'reallocated sectors' (sectors which have been found to be damaged, and have been moved) and no 'current pending sectors' - bad sectors which are awaiting reallocation, if possible. Interestingly though, the SMART information for the drive is completely clear of any problem whatsoever.WD DLG gives the hard drive an overall 'Pass' status on health, which is possible and may be accurate if the drive has not reached the SMART warranty threshold.

This system has experienced problems accessing blocks on the second drive in the system.This means that using the DLG tool and getting a perfect, clean bill of health from the tool may not provide an accurate assessment of the drive's health. Or it may not report some SMART attributes correctly ay all. However, it appears that DLG may sometimes only report any failing SMART information once the warranty failure threshold has been reached. This software can provide a number of hard drive tests - including a full surface scan, known as the Extended test - and also reports back drive SMART health information. Western Digital provide the Data Life Guard Diagnostics software for both Windows and DOS boot.

Data lifeguard diagnostic