what 4tb drive would you suggest? and how do i do this formatting malarkey?
OSX does support NTFS, as read only though so I wouldn't bother formatting your own new drive as NTFS. Just imho.
You can use Disk Utility to format the drive. When you get the drive, plug it in. Then hold down cmd+spacebar, type disk and hit enter. Disk Utility will open. Let me google a guide for you: http://bit.ly/ZVATRz
OSX does support NTFS, as read only though so I wouldn't bother formatting your own new drive as NTFS. Just imho.
You can use Disk Utility to format the drive. When you get the drive, plug it in. Then hold down cmd+spacebar, type disk and hit enter. Disk Utility will open. Let me google a guide for you: http://bit.ly/ZVATRz