The 600AB features a whopping 2 platters... so, as one would guess, heat and noise are non-issues. The drive barely becomes even slightly warm to the touch- it's about as cool as they come. Despite the lack of fluid-based bearings, the 600AB's idle noise, as well as that of seeks, is virtually non-existent.
In conclusion, Western Digital's newest 5400 RPM drive is one of only a handful of contemporary ATA drives that universally improves on its predecessor. As its 7200 RPM brother did, the 600AB bucks the trend of sacrificing performance for the relentless pursuit of areal density. Though it doesn't quite offer the IOMeter results of the IBM Deskstar 40GV nor the 80 gig capacity of the Maxtor DiamondMax 80, the 600AB delivers much of the strengths of both. It's a winner.