EDIT2: A fix is now available. Everyone should install the new firmware! http://www.crucial.com/support/firmware.aspx. For anyone having trouble with the firmware, there is a guide to do it from USB stick here: http://www.storagereview.com/how_upgrade_crucial_ssd_firmware . EDIT: Appears there is a firmware fix coming - http://forums.crucial.com/t5/Solid-State-Drives-SSD/BSOD-Crucial-M4/td-p/79098 Just a heads up for anyone that is getting BSOD's every 60 minutes or so (as I was) and have spent the last week trying to diagnose it (as I was): There appears to something that is killing a lot of Crucial M4's in the last couple of weeks that is presenting with identical symptoms for a lot of people. Basically it involves the SSD hitting around 5200 hours of usage and then a particular error in the drive causes it to disconnect and, if it is running your operating system, a BSOD occuring. This fault occurs approximately every 60 minutes, so if this happens there will be the chance to reboot and backup data while we wait for the firmware fix to arrive. The fault effects all firmware versions, all operating systems and all motherboards. To check the number of hours your drive has done, use an application that allows the reading of SMART data (such as Crystal Disk Info) and look in the hours column. THIS IS ONLY PRESENTING IN DRIVES >5200 HOURS, so unless your running 24/7 since purchase you won't be very near such a point. There has been at least one person claim that after several lockups, the drive just disappears entirely, so if this starts happening, clone what you've got to another drive and leave it till new firmware (or prepare to RMA it). Links: http://forums.crucial.com/t5/Solid-State-Drives-SSD/0x00000f4-error-on-M4-64GB/td-p/76392 I can only imagine how many more haven't yet even diagnosed the SSD is the problem (or that probably don't know how to). So try and spread the word to as many people who have the drive as possible.