I know not to defrag an SSD drive, but I installed a Samsun 840 250gb into my Tower, then used the migration software that came with it. After I defrag my C: drive and used the migration software to move over the data on this drive new SSD drive, at approx. 98% complete it stops ( the migration software ) and displays an error ( defrag failed ) migration then stops and nothing is moved over. Does anyone know why this software wants to defrag an SSD drive? and is there a way to fix it? Thanks Mash