From a recent computer help topic I posted, it seemed like I was a victim of Disk Head Collision. It seems fixed now. But I don't understand how this works.
Here is my basic interpretation of a hard drive from what I've read in a book.

If this is correct, it's basically an ensemble of record players, without the big horns.
What I thought Disk Head Collision was, was when the heads of the "disk readers" colliding. Is this correct, or is it the heads colliding with the disk?