What makes an ES?
The Barracuda ES is based on the same drive platters and mechanics as the 7200.10, but it's built to withstand cramped rackmount enclosures where drives can be packed tighter than steerage class on a budget airline. All hard drives vibrate during normal spinning and seek operations, and those vibrations can disrupt the operation of a drive in close proximity by shaking the drive head off its intended path. The disrupted drive must then wait for its head to move back into position before resuming normal operation, resulting in a performance penalty.
To combat vibration-induced performance degradation, the Barracuda ES is outfitted with sensors that detect rotational vibration and adjust the drive head accordingly. These sensors allow the ES to tolerate a rotational vibration of 12.5 rad/second2 with a rotational profile of 20-800Hz. The Barracuda 7200.10, on the other hand, can only tolerate 5.5 rad/second2 between 10 and 300Hz.
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