New story submitter CSHARP123 writes "Microsoft has posted details about a Windows 8 feature that is a hybrid between cold booting and waking up from a hibernated state. This feature is called fast startup mode. Gabe Aul, director of program management in Windows, explains: '[A]s in Windows 7, we close the user sessions, but instead of closing the kernel session, we hibernate it. Compared to a full hibernate, which includes a lot of memory pages in use by apps, session 0 hibernation data is much smaller, which takes substantially less time to write to disk. If you’re not familiar with hibernation, we’re effectively saving the system state and memory contents to a file on disk (hiberfil.sys) and then reading that back in on resume and restoring contents back to memory. Using this technique with boot gives us a significant advantage for boot times, since reading the hiberfile in and reinitializing drivers is much faster on most systems (30-70% faster on most systems we’ve tested).' The post contains a video as well, which shows Windows starting up in less than 10 seconds."