The drive runs as fan, of course, very quietly. Only with read-write access can be heard at all that it works. Even with extensive stores and copying in the GB range, the tandem heated no more than an actively cooled system. Your actual work performed, the WD drive thanks to FireWire 800 at high speed.
Reliable on the FP at idle to standby. However, I am still looking for a setting that allows the connected together with FP to switch to the Mac in its planned hibernation. Until now, I'll do this manually.