I have an external DVD-RW on a shelf just in case. Every once in a while I need to bring it out and I wonder if a giant boulder is going to start rolling at me when I grab it.
I actually have a SATA cable and power plug discreetly tucked in a spot in my PC case and have just taken the side off and plugged in a drive on occasion. It's normal purpose is troubleshooting other hard drives, but it works for that too