Regardless if you are using windows or Mac you have to format the drive attached to your Airport Extreme as Fat32 or if on a Mac, Mac os extended journaled. Once connected to the Airport Extreme on a windows machine you can click on the icon in the bottom right tool bar, sorry can't remember what it's called. Once you click on this icon you will see the name of your router for example "Office" click on that name and you will be prompted for the password on your router. Supply the password and you will see that drive as a networked drive. On a mac you go to finder and will see the name of your router under shared. Double click the name and then double click the name of the router and supply the password. You will see the drive on your desktop. I use mine for wireless Time Machine Backups and I love it. I have really started liking all things Mac compared to my Windows experience. Can't wait to add a Mac Desktop.