Intro to File Systems:

The picture

	|-------------------------------|
	|				|
	|	      Apps		|
	|				|
	|-------------------------------|
	|				|
	|     I/O and File Systems	|
	|				|
	|-------------------------------|
	|				|
	|	Storage Devices		|
	|				|
	|-------------------------------|

File systems perform a uniform abstraction to storage devices
-- everything is a block/file/directory
-- multiple devices appear to be congtiguous
-- simple, rich naming (abstractions): symbols, structured tree, unified
-- flexible block assignment
-- makes disk appear to be fast
-- consistency in the face of crashes

Bottom of the OS:

	|-------------------------------|
	|				|
	|	   Rest of OS		|
	|				|
	|-------------------------------|
	|				|
	|	 Device Drivers		|
	|				|
	|-------------------------------|
	|				|
	|     1,000's of H/W devices	|
	|				|
	|-------------------------------|