Quick test: 
Gateway 7330GZ (PC Linux, Fujitsu HD 80 GB, no clicking) with over 66,000 load 
cycles ~60 load cycles per hour:
with -B 255 it completely stops the load cycles.

DELL 1400 (Ubuntu, Toshiba HD 160 GB, no clicking) 4,500 load cycles ~60 load 
cycles per hour:
 -B 255 or -B 244 did not change the load cycles.

Same DELL with Windows XP, Sp 2: ~60 load cycles per hour (no clicks).
Changing power management settings did not do anything.

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High frequency of load/unload cycles on some hard disks may shorten lifetime
https://bugs.launchpad.net/bugs/59695
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Bugs, which is the bug contact for Ubuntu.

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