If anyone's interested, I've done some more research on Travelstar 
noise levels. From IBM's product datasheets (prices at Googlegear):

Travelstar noise levels (Bels)
40GN (4200RPM) 20GB ($89): 2.1 idle, 2.7 operation
40GN (4200RPM) 40GB ($128): 2.4 idle, 3.1 operation
40GNX (5400RPM) 20GB ($98) or 40GB ($145):
2.5 idle, 3.1 operation (typ); 2.7 idle, 3.3 operation (max)
60GH (5400RPM) 60GB ($271): 2.5 idle, 3.5 operation

My experience with a 40GN 20GB compared to a 40GNX 20GB about match 
these specs, I'd say; the latter is a little louder, and the sound 
quality is a little different - slightly more obtrusive. I suppose 
this is the price of the greater speed. But all these drives are 
vastly easier to live with than the earlier non-FDB IBM models like 
the 6/12/18GB (and related 25GB) DARA-series drives that came stock 
with Lombard and Pismo PBs (IBM's datasheets don't list any acoustic 
data for these models).

Andrew Main

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