Reports are coming in from the Microsoft Community forums, regarding possible causes triggering system hangs in the Windows 10 Anniversary Update, 1607. A thread has revealed the IRST Driver as the likely culprit. IRST, which stands for Intel Rapid Storage Technology, is a storage driver developed by Intel for use with a variety of storage configurations; such as RAID (redundant array of inexpensive disks) and SATA drives. Modern operating systems such as Windows 10 no longer require IRST driver and can manage such configurations out of the box.
AHCI which stands for Advance Host Control