I'm sure you are all very familiar with this situation: Going to sell your old MBP and need to wipe clean completely (for security purposes). Am running YOSEMITE - but originally came with 10.5 Leopard. What buyer would want that OS now anyway? Is it necessary to restore to 10.5 on disks? If someone has the patience and doesn't mind directing me toward the best way of wiping clean to new MBP state, I would greatly appreciate it! Cheers!