gotcha and cool....think i'll wait however that seagate 1tb sshd or wd's sshd do they have 2 tb for a decent price as that is what im wanting to go to and is there anyway to make a 3.5 inch fit and could the console handle the voltage
For the 2.5" FF, 1TB is as high as SSHDs go with both, and my guess as to the reason why would be drive thickness. Both make a 2.5" FF 2TB mechanical HDD, and if faster load times aren't a priority, that would work for you; Seagate also has a 4TB 2.5" and I believe WD does, or will soon . There's numerous blog posts and videos demonstrating the ~20 - 25 second gain you get by switching to an SSHD for the internal drive, dropping a cold boot time from ~50 seconds to ~30 with an SSHD, with an additional gain of ~2s with an SSD. Game load times increased by ~ 10s with an SSHD over a plain mechanical.
If you need/want more storage than 1TB, I would recommend running a 1TB SSHD for the internal drive, and utilizing an external 2.5" drive via USB3. This ensures you get the boost in speed for load times, while still providing you with a large storage medium.
In regards to a 3.5" drive (I was having this exact conversation with another user on
iFixIt the other day) things get a bit grey due to do the licensing agreement with Microsoft for the Xbox One. While the license is a software license only, the way two things in it are worded does provide the ability for interpretation not in the end user's favor. I don't believe it would actually create an issue with Microsoft, but I am curious how Microsoft would interpret such a modification.
I personally wouldn't recommend utilizing a 3.5" drive in a console, as there's too many cons for doing so, from the fact the console wasn't designed for a 3.5" drive, to the fact it will cause more heat, draw more power, and possibly restrict adequate ventilation to the board and processors (if installed internally into the console). This is simply my personal opinion, so if you'd like to try, give it a go and see how it goes. I would recommend a few things however: since the console wasn't designed for a 3.5" drive, you'll need to use a multimeter to determine the voltage on the molex power connector. I would also encourage doing as much research as you can beforehand online to find out if anyone has done so and what results they had.
My personal moto: don't mod something you can't afford to lose or break. If money isn't an issue, wait until June or July when Samsung releases their 2nd gen 850 Evo/Pro series SSDs, which doubles all currently available sizes, with their largest 850 Evo/Pro SSD being their 4TB one (the new sizes will be 256GB, 512GB, 1TB, 2TB, and 4TB all in the 520MB/s read/540MB/s write area with Evos carrying a 5yr warranty & Pros carrying a 10yr)