Again, Crucial gives us here a disk of excellent invoice, the unbeatable quality / price. Only 7mm Thick (but comes with a 'spacer'), it will be easily integrated into any notebook PC. Only downside, the Acronis True Image software comes with (download and activate it with the code provided in the box) does not work with formatted disks using GPT partition tables (the format supported by the BIOS UEFI-they are told and now- all replaces the MBR). This plant restart when we want to clone its primary disk. Worse, I strongly suspect this software to have me 'broken' my Windows 8.1 systems by destroying some files in the process, preventing normal shutdown my PC (the only way through a wild action on / off button). Only restore the registry helped me avoid a complete reinstallation. In this case, do not use it (there are many other free cloning utility and as effective on the net ...).