I'm looking for an external SSD for my Mac Pro (late 2013) specifically for running windows 10 and some programs. Right now I have my 250GB internal SSD partitioned, but it's not big enough for all my software. I know external SSDs can be expensive, especially for one fast enough to run an OS and some intensive software from, so that's why I was thinking it might be cheaper to buy a solid state drive and enclosure separately and put them together myself. I just have no clue where to start, or exactly how fast it even needs to be in order to run software from like an internal drive could. I figure it should at least be either USB 3.0 or Thunderbolt. I also don't want to go for the absolute cheapest thing if it ends up simply not working, even though low price is my priority. I'm hoping for around 250GB. I'd appreciate any suggestions as to a good and inexpensive external drive setup. Also, I'm curious as to how fast exactly an external drive should be in order to run installed software from, like read/write speeds. I haven't been able to find this information myself.