Hello I am about to buy a SP2 Pro which will have Win 8.1 (I think) and want to use it transferring files back and forth with my desk top PC running Win7Pro. Both are 64 bit operating systems ( I understand). If I link the SP2 to my desktop with a USB cord will the desk top simply see the SP2 as another external hard drive so I can share files between them and work on the same file on either depending on whether I am at home or out? Does it matter that they use different operating systems? Thanks in advance for your help.