When Apple released OS X 10.10.4, alongside the offering came an implementation of Trim technology to clean up and potentially speed SSD write speeds over time. Users choosing to activate the feature, previously only on Apple-provided SSDs were greeted with a dire warning about the potential for data loss should the feature go bad in any way. After a good first pass, MacNN has concluded its second round of testing on a drive series thought to be problematic with the command -- the Samsung 840 and 850 drives, both in pro and EVO lines.
