I've been missing some files I never backed up on my old computer. So I managed to hook up my old computer's hard drive to my new computer.
[spoiler=Technical complaints, don't read if you can't understand technobabble or TL;DR]Originally I tried using one of those SATA > USB adaptors, but the connection was shoddy and it kept asking to format it. Then I finally took a look inside my new computer and found out that despite this thing being a Dell (which, if you've ever seen the inside of one, it's like a [tornado fang]ing wire jungle with irritating hard-edged chips and case parts) it still had a dedicated port and housing slot for a second hard drive. So I plugged it in, after having to untie the power cables so the second one could reach the new (old) hard drive, which involved NOT cutting the wires to get all the zipties off (seriously Dell?) then trying to navigate the maze of silicon, copper, and steel to get the data cable plugged in, and finally it worked without a hitch.
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I decided to leave it in there...especially since I found my still-functioning Artificial Academy ISOs, PS1/2 game ISOs, lots of config scripts for GlovePIE and the like, and my entire music library. Plus, the new drive is labeled J, and the default is C...so the drives make C J, which is my real-life nickname
Also, I love Italian food. A lot.