Keep in mind it says 'hard disc drive' MP3 players, not all. So the pictured ZEN, which is flash-based, would not apply (unless the summary is wrong, I didn't RTFA).
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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Keep in mind it says 'hard disc drive' MP3 players, not all. So the pictured ZEN, which is flash-based, would not apply (unless the summary is wrong, I didn't RTFA).