I am a member of Windows Insider Program (WIP). I have been running Windows 10240 on a separate HD. I had been experiencing some issues with the build, so I decided to Refresh the OS this morning. The Refresh started up and was running along, when it stopped and started the normal rollback process. A few minutes into the rollback it crashed. It gave me three options, two versions of Windows 10 and a Restore. I selected restore a it immediately crashed and sent me back to the same 3 options. But, it indicated there was an "inaccessible boot device". I am at a loss as to what to do. I want to remain part of the WIP, but to do that I need to fix the OS on the drive or reinstall the OS. The OS is still on the drive, but I can't get to it and make it boot-able. I will appreciate any suggestions. Regards.