Upload & Sell: Off
Have you ever had a bad Sandisk card? What program are you using for the test?
I've had no hard failures on Sandisk cards, but one bad partition table.
I use several apps. A simple, free one with wipe and testing features and that has no activation was Lexar Image Rescue 3. I don't think it is available from Lexar anymore, but perhaps it is on the web somewhere.
BTW, when the queen of recyling was about to dispose of the Sandisk boxes, it was observed that there is a small certificate wedged in the box. Apparently you now get only a 1-year subscription to the recovery service. Has anyone tried this app and is it difficult to uninstall? I have 8 certificates from the cards last week.