The HR20/21 is upgradable by replacing the internal drive (voiding your lease) or getting a External eSATA drive. The eSATA drive will replace the internal so you don't get the combined space.
“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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The HR20/21 is upgradable by replacing the internal drive (voiding your lease) or getting a External eSATA drive. The eSATA drive will replace the internal so you don't get the combined space.