Apologies if this is a really dumb question, but after using Windows PCs for nearly 20 years, I'm looking to buy my first Mac - probably one of the new MacBook Pros. Could someone please explain how I would install OSX Mavericks on a Mac (with no CD / DVD drive), in the event that I needed to replace the hard disk or even if I reformatted the hard disk as I tend to do on a yearly basis with my Windows PCs ? I understand that OSX Mavericks is free, but when I look at the Mac App Store, it says 'To download OS X Mavericks from the Mac App Store, you need a Mac with OS X 10.6.6 or later.' Obviously if the machine has just had a new hard disk or if the hard disk has been reformatted, it won't have any version of OSX installed. I'm sure it's just a different way of managing things, but I've been so used to Windows PCs that have a DVD drive and a copy of the O/S on a disk (MSDN) that allows me to reinstall everything very easily onto a clean hard disk. Does a new Macbook Pro come with a copy of OSX Mavericks in the box ? I understand that I can plug in an external DVD reader. Apologies again if this is a dumb question, but I'm really looking forward to making the leap from Windows to Macs. Thanks in advance.