Reddit mentions of Xbox 360 500GB Media Hard Drive

get a 500GB hard drive:

• knock-off (may not play original xbox games)
  
• official
  
  You need a at least one additional controller (if not two more). You might also consider getting a 64GB USB flash drive to use for additional Xbox storage. You can use smaller USB drives, but the 64GB allows you to get the full 32GB of Xbox storage, and still have room for movies and music. Hit up craigslist or your local equivalent for deals on games, especially games that require accessories (eg guitar hero, rock band, skylanders, etc.).
  
  Lastly, on the 360, every account needs a gold sub to play online. it's lame, and Microsoft fixed this with the Xbox One, but if you want your kids to have their own accounts (I would), you will be ponying up for more than one Gold sub if you want to allow them online. at $60 a pop, you should spend a little time looking for some deals. Last week there was a deal for $35 for a one-year gold sub. that's pretty good. $40 is not bad either. $50 is kind of standard. One thing Microsoft did fix on the 360 is you no longer need a gold sub to use streaming services like Netflix, Amazon, Hulu, et al.
  
  Best of luck, and enjoy your console. there is still a ton of value in the Xbox 360 platform.

Why 250GB? Go for the 500GB for less than $40.... Just put one in an Xbox 360 S I had sitting around collecting dust.

https://www.amazon.com/gp/product/B00MAPYKPO

https://www.amazon.com/gp/aw/d/B00MAPYKPO/ref=mp_s_a_1_1?ie=UTF8&qid=1488099580&sr=8-1&pi=AC_SX236_SY340_QL65&keywords=500+gb+hard+drive+360&dpPl=1&dpID=31rgf-LgWmL&ref=plSrch

I second this. You'll also need a hard drive if you're looking to play games like Titanfall that require it, or use the replay function in Halo: Reach. Also, those 4GB will get eaten up very quickly once you start downloading games, videos, and other content from the Xbox Store.

https://www.amazon.com/Xbox-360-500GB-Media-Hard-Drive/dp/B00MAPYKPO/ref=sr_1_3?s=videogames&rps=1&ie=UTF8&qid=1500827323&sr=1-3&keywords=xbox+360+hard+drive&refinements=p_85%3A2470955011

If they are using an external drive to save and install games to, they have modded their XB360 to do so and risk the chance of being banned from XBL. While it is possible to install a third party's hard drive internally on your XB360, it takes several steps to prep the drive which include downloading an image and some tools to get it installed properly. While not impossible to do, there are only certain drives that will work for this and it's a bit of a pain in the ass (I did it a while back myself). Your easiest way to do upgrade is to just purchase an official drive.

This one is for the original large body style 360's, and this one is for the slim case.