How do I remove unwanted OS X User Accounts? When starting my MacBook Pro I get 4 Accounts to choose from and need to choose one of them.  One of the 4 Accounts is named Guest - will keep this.  The other two are not wanted. One has Admin below it. The other has Standard below it.  The one I use is Peter with Admin below it. How to remove the two unwanted Accounts?
The 'discs' you're referring to are users for your computer.

In the system preferences pane, click on a user, for example QCD in your case.

Now click on the '-' sign under 'Login Options;

This should do the trick.