How is it that you can undamagingly remove a rugged drive?

In Win XP, when you pop surrounded by a USB memory or pen drive, you see a little statue next to the clock ni the taskbar to Safely remove it. (usually F: drive).



But I've see some PCs with the deeply same icon for undamagingly removing the HDs! (C: and D: drives).



How is that so? What if I clicked on it and removed the hard drive? Would the PC become unoperative?



Thanks for your answers!

How is it that you can undamagingly remove a rugged drive?

depends on if the drive you are going to remove is a primary... if your dealing beside a laptop, then you could remove one of them specifically not the primary without a problem... however, removing the primary would definately stop it from working.
Nope
You should never remove or put contained by parts while the computer is on. EVER!
They must have be an external hard drive you saw.
Windows sometimes get antsy about removing devices that it have recognized. The little record box tells you that it's ok to remove it. No big traffic. On Windows ME, on my second computer, it goes bonkers if I remove a USB device minus permission LOL