Hey I used to have a Xbox 360 Pro with the original 20GB HDD. It broke and I got a new arcade system and switched over my HDD from the Pro, but now I am out of hard drive space. I was wondering if I could backup my games and then replace the 20GB drive in the enclosure with a WD 2.5" 250GB SATA 5400rpm hard drive and would it work on my 360 arcade?
Physical size-wise it will fit, but capacity-wise you need to check the console hardware specs to see what max hard disk the system will support. I briefly read something like 120 GB but you need to verify this.
And whatever new disk you get, you must NTFS format it before it can be used.