The Cheetah 73's large platter count requires a more powerful spindle motor and actuator- things that don't bode well when it comes to heat and noise. As one would expect, the 73 is noticeably noisier and quite a bit warmer than the Cheetah 36LP. In most cases, active cooling is warranted. Noise-wise, there fortunately is no more a grating, high-pitch whine than with the 36LP. Seeks, however, are definitely more "visceral," for the lack of a better term. You will definitely know this drive is there .
Overall, the Cheetah 73 delivers the performance we'd expect... a notch below the Cheetah 36LP but quite swift nevertheless. Even so, we're hesitant to recommend a 1.6" high drive to most users. Though there are some advantages (higher GB/$ ratio, takes up less space than 2 properly-cooled 1" drives), the costs when it comes to heat and noise are not insignificant. If you truly need 73 gigs right now, yes, consider the Cheetah 73. Otherwise, drives such as the Quantum Altas 10k II (sub-73 gig versions), the Cheetah 36LP, and especially the Cheetah 18XL will deliver performance that's a bit better along with substantial drops in acoustic and thermal issues.