"If your boot disk for your Mac ever gets damaged or lost and you need to replace it, Apple will send you an exact replacement for your Mac for a nominal cost," John Carter reports. "If you have an active Apple Care contract, the cost will be $16.00 plus tax. It may cost more if you don't have an active Apple Care contract. They will ship the new disk overnight, so if you order before 4 PM California time you'll get it the next morning. Call the Apple technical support for details if you need this service.
"Keep in mind that should you need to replace your original boot disk, only an exact replacement is guaranteed to work. The local Apple dealer may be able to create something that might work, but it is not something you want to depend on and only Apple can prepare an exact replacement disk."