diskscan
Diskscan is intended to provide the information needed to decide if a disk is good or not, be it an HDD or an SSD it is likely to be holding important data and if you have a suspicion that it is failing it is also important to know how bad is it down the road. Diskscan will only perform reads in its disk surface scan so it is not destructive in any way and it will report on all the key metrics needed to decide if the disk is good or not, currently that includes reporting all the errors that were encountered, a latency histogram over the entire surface and a graph of the min/max/median latency over the disk surface.
