Windows 10 (Unhappy) Anniversary Freezes Computers
Microsoft revealed yesterday that they have received a small number of reports (translation = a large number of reports) that their Anniversary Update (translation = new Windows image) freezes your computer if you use a combination of SSD and HDDs. The freezing symptoms, apart from you not being able to do anything, include that old Windows 10 favorite, 100% disk utilization. You are advised to revert to your previous Windows 10 build, noting that you only have 10 days to do this. Or move all your data from your massive HDD to your really small SDD.
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http://answers.microsoft.com/en-us/windows/forum/windows_10-performance/windows-10-may-freeze-after-installing-the/5a60d75d-120a-4502-873c-8bfec65c82d0