Genuinely curious, what spinning drive couldn't cope with being behind a motherboard tray?
It's a toasty space as there's a GPU cooking the motherboard which heats up the back of the tray in that area, there's zero airflow back there due to space even in a full size Fractal Torrent, and it was a 7200RPM drive. They might handle zero airflow in an open area, but they absolutely need airflow if you stuff them in a tightly confined area where heat will build up.
It's a Seagate 320GB 7200RPM that has over 13 years of power-on hours count. It's 20 years old now. But it is heat sensitive, it will work perfectly up until near 50c, after it will be unable to read anything and will drop from the system. Temps in the screenshot are high because this was my attempt to put it in the Torrent, any other case its temps stay under 40c. Sorry for the giant size, not sure how to fix that.
The reallocated sector count was from its first major overheating event when the house AC failed during a Texas summer and the NAS it was in couldn't keep the drives cool enough. Been using it as a desktop scratch disk ever since until 2023 when my choice of computer case didn't have a place for HDDs that made any kind of sense. I had really wanted to keep it in my desktop just to see how much higher the counter would go...
