Haha, its a macbook air sono disc drive. Any ideas. Thanks for your help!
A bit out of date but if you press CMD R then should take you to the partition and from there on in all the advice in this article should be pertinent
http://www.tuaw.com/2010/09/24/mac-101-preparing-your-old-mac-for-sale-or-recycling/
Don't forget to change security settings to 7-time pass