Desktop means it has it's own ac connector that you have to plug into a socket. Portable just plugs into the usb of your pc and gets power through there. This is still very portable so long as you have an ac outlet to plug it into. Also Desktop tends to be faster than Portable. With portable both power and info are going through the one usb port which bottlenecks how quickly either can get through. Also if you plan to use this as an External drive for video game system then always go for a Desktop one with it's own power supply. You can really harm your system by leaving portables hooked on them for too long.
I think it depends on if you are buying "new" "used" or "refurbished" - in my case I bought mine new, it came with 1 year warranty if I remember right, I am sorry I cannot find my paperwork for it at the moment, but in my mind I think it is one full year.
I bought mine in January 2014, so if you have an older or newer model this may not apply.
The front surface of this is flat, but slightly angled, so setting mine on the front was not stable. It stands up, but the slightest bump would knock it over onto its top.
The sides however are flat and at a 90 degree angle to the top/bottom. It can stand that way and is more stable than standing on its front, but I still wouldn't leave it that way unless there were some support to keep it from falling over if I accidentally bumped it.
The dimensions... a little bit bigger than a 3.5" internal drive would be except a little taller. The venting is good and she doesnt overheat after 2 hours of movie watching from a file located on the drive.
Windows7 Not compatible? -NOT TRUE.. I have my movie collection on this thing:
Its compatible with my smart TV, Win7, Win8 and Mac Lion (Plugged in Physically and or networked in).. I have used each of these platforms with the 3Tb and without fail.
Anyone tells you different, I would have a concern. I use mine every day.
The only thing that could cause you an issue is if it came as a refurb from previous owner and that person re-partitioned the drive for some other purpose that isnt Win7 friendly. New and out of the box,, shes ready to go. Refurbed (if not) just needs a repartition and formatting.
Of coarse there's a manufacturer's warranty.
You just go to Seagate.com as the warranty card in the box instructs you to
and register the drive, you will need model and serial numbers.
Keep in mind that with like with any drive warranty it only covers the drive and not the data
stored on it, so if there is valuable data that you can't afford to lose then you will need another drive
holding the backup of that data so if you need a replacement you will still have your data backed up.
This goes with any drive, also with any drive do not allow your drive to fall off a table
or subject it to a shock like fall, hit, or drop something on it.
Just like any delicate item you can't expect it to work after sudden trauma like that.
Currently external HDD's are not supported on PS4, I assume you were asking if it fits inside. If so, then if the HDD is 9.5mm and 2.5" in size it will work. From my research the best deals are actually external drives, just have to open the enclosure to remove the drive to install it in the PS4.