file manager of Mac OS X = the Finder
file manager of Windows = Windows Explorer or explorer.exe
main hard drive in Mac OS X = named "Macintosh HD" by default
main hard drive in Windows = mounted as "C drive" or " C: ", and named "Local Disk" by default
drives in Mac OS X = displayed on the Desktop and displayed in the "Computer" folder (the name is whatever you named the computer)
drives in Windows = displayed in the "My Computer" folder
It's kinda funny.
I think most Windows users have no idea what their file manager is actually called.
I myself have been a Windows user for many years, and it's only when I became more computer savvy that I became aware of that.
This is mainly because Microsoft decided to not label the Windows Explorer windows (folder windows basically) as "Windows Explorer."
So instead, most people just think of them as "folders," and not the windows of a program.
But in reality, they ARE just like the windows of any other programs. (i.e. Word, or Paint, or Internet Explorer)
Sure, this might be a good idea, because you want to create a better illusion for the desktop metaphor. Obviously, in real life, your desktop and folders aren't part of some "Windows Explorer."
The problem arises when some error occurs, for instance, Explorer crashes.
They'd see a message saying "Windows Explorer has crashed" or "explorer.exe has stop responding,"
but... how would they know what this "Windows Explorer" is? You never mentioned the name until now!
That's also why a lot of Windows users call it "My Computer" or "My Documents."
Because that's usually where they start off in the folders, so it's pretty much the only name they know.
In this respect, at first glance, Mac OS X might seem more complicated. "What's this Finder business?!?"
But in the long run, it actually allows users to be more aware of what's really going on and how the computer actually works.
OK, enough rambling. ;p