Bad blocks and read errors on MX300 disappear! Is this a self-healing SSD?

Kilobyte Kid

Bad blocks and read errors on MX300 disappear! Is this a self-healing SSD?

After about 10 months of use in my Mac Pro, the 2TB MX300 SSD suddenly started generating read errors during backup operations.  When checked with TechTool Pro 8, it repeatedly found several hundred bad block that were unreadable.

 

I started the RMA process and pulled the SSD out in preparation for shipment.  I used Disk Utility to securely erase (6 passes) the SSD; out of curiosity I did another TechTool Pro 8 surface scan and found zero bad blocks!

 

My question is:  is this SSD reliable now and usable as my boot disk, or should I still return it?  I'm concerned this could happen again in the future; am I right?