Block Diagram of System Kernel - gotothings Block Diagram of System Kernel. Device drivers are the kernel modules that control the operation of peripheral devices. Block I/O devices are random access storage devices alternatively, their device drivers make them appear to be random access storage devices to the rest of the system. UNIX KERNEL AND FILE MANAGEMENT Architecture of Unix OS Below figure shows the block diagram of the UNIX OS(kernel), view various modules and their relationships with each other. In particular, it shows the file subsystem on the left side and the process control subsystem on the right side of diagram. These are the two major components of the kernel.