Would it make any difference to hard drive temps if it were an Atom or Fusion system, with lower heat-generation vs. the SPCR test?
Probably, but as that was not tested, and no other reviews even mention it we simply dont know by how much, 1C.? 10C.?
The fan I could potentially just remove from the system, and just rely on the Atom or Fusion fan for cooling.
Yes, that would work, but as we know largers fan that spin slowly cool as well as or better than a small fan that spins quickly and makes lots of noise.
Would have considered this case for a light-use server, where Atom or Fusion would be enough CPU, and something like a 320GB 2.5" disk is enough storage. I have something similar in an ISK300-65, and would have liked to go to the smaller ISK 100 for a similar system I am considering.
Exactly, mini-server, backup server, HTPC or a surveillance video recorder hidden somewhere using a Fusion APU would be ideal, but compared to the ISK-300 with 1/2 slow-running 80mm fans, and the better quality, the better HDD cooling and slightly cheaper price plus the ability to use a DVD drive makes the ISK-100 a poor contender. The only exceptions are for anyone where the physical size is the highest priority.
BTW, I has a look at the ISK-310 earlier - DO NOT TOUCH - it has an integrated fan cooled 150w PSU.