The main issue with including Halo 5 into the MCC is because of its File-size, you do know the collection on the Xbox right now is over 100 GBs (I think its about 120 GBs actually) so with that game it would skyrocket to 200 GBs, which is bigger that a single older 120 GB SSD would be able to handle.I kind of find this a mute point as game load times are not all that faster on a SSD (About 4 to 5 seconds in load times) I had it on Both a 5TB Hard drive and on a WD Blue SSD 3D Nand SATA 6GB/s M.2 2280 SSD 1TB Drive to see the difference So all they Hype how a SSD will boost your gaming load times is mostly bull as a 2% to 3% increase is not all that flash, Now in file transfer and boot times they rock.
So with dirt cheap 2.5" USB hard drives in the Terrabyte range, game size is no longer a real concern storage wise. Take the Western Digital My Passport 2TB USB 3 all of $85.00 Australian or about $65.00 USD. Game size is no longer a reason not to include HALO 5 on PC or in the MCC collection.
There is no way the SSD wasn't insanely faster than your standard HDD.
On tests with games like Halo MCC and Destiny 2 load times are cut to almost 50% on an SSD vs the Xbox One X internal drive or an external hard disk.
I've done the research and even built my own external drive with a kit and a SSD from Micro Center as an experiment to see how much performance boost an SSD would benefit an Xbox.
I have included a screenshot
from the Samsung Magician
software that bench marks performance and checks drive health.
I have a Samsung 7200RPM platter drive that is pretty fast and reliable used to mass store games, pitted against a generic Walmart bin 120gb SSD from SanDisk that I load MCC and or Destiny 2 onto occasionally, and you can see that the SSD WHOOPS the platter drive handily.