Hard drives get hot too...
I used to work for a corp. that developed voicemail software.
Back then, the largest hard disks were 512 MB each, 5.25" drives that were several inches thick and gave off a lot of heat, and they required mapping of the error blocks, so we kept the printouts with the computer that housed them so we could reformat the drives if necessary.
I was in the QA lab late one night when I got a call from the CEO that the in-house voicemail server was down - would I go look at it and see what the problem was?
I went to the server room (a broom closet re-purposed for the in-house voicemail servers) and looked at the production server. I found that the person who had setup the server had stuffed the printouts of the error blocks between the hot drives and the drives had overheated and eventually started having errors. I took the server down, pulled the drives, copied as much data off them as I could onto other drives from the QA lab, and replaced the drives. I was there until well after midnight.
A lot of people lost a lot of voicemail that night. I don't recall just who had setup that server, but I sent out a company wide email explaining that while it was a good idea to keep the error block printouts with a computer, it wasn't a very good idea to block the airflow in a computer, especially in and around physically large hard drives that give off a lot of heat. We were lucky there wasn't a fire.