Q: When we rm a file, what actually happens?  Does the file vanish?
	ans:  
	1) the entryin the directory is cleared
	2) the link count for that inode is decremented

A: the disk has three parts:
	superblock	-- 

A: if no more links to file, then:
	- the data blocks are all put back on the free list (ie recycled)
	- the inode data structure is set to ?? but marked as free