I use R8 "pipe/duct" insulation with integrated vapor barrier, on all the exhaust vents from the portable units I have setup in my server room. Works grea.
I have used them both as single drives and in RAID0 arrays for "scratch disk" purposes, for which I found them to perform quite well. The two 1TB in RAID0 short-stroked to 300GB each provides a great deal ofssequential bandwidth and is a nice temporary space for in-progress work.
I also use...