#WindowsInternals #Drivers (1/7)
Drivers are call back mechanisms to send or retrieve I/O between the operating system and devices such as NIC’s, Storage Controllers, and USB keyboards and mice.
They are typically loaded during the system boot sequence (after NTLDR but before Ctrl+Alt+Del presentation). (2/7)
They are typically loaded during the system boot sequence (after NTLDR but before Ctrl+Alt+Del presentation). (2/7)
Device load order groups ensure driver load in the correct order, such as A/V filter drivers loading after the NTFS.SYS has initialized as an example. (3/7)
(4/7) 
Most of the requests that are sent to device drivers are packaged in I/O request packets (IRPs). Each device is represented by a device node, and each device node has a device stack. (5/7)
Sometimes more than one device stack is involved in processing an I/O request. Regardless of how many device stacks are involved, the overall sequence of drivers that participate in an I/O request is called the driver stack for the request (6/7)
(7/7)
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