I looked at several SSD M.2 and then I just decided to go because of the price for Transcend and because I already own an external hard drive manufacturer, with which I am very satisfied. The SSD is used for offline operation of Chromebooks as additional memory, because the internal 16 GB were simply too small. On the Internet there are plenty of instructions on how to exchange the SSD. I do not regret the purchase and the memory upgrade has made already paid.