Why should Hard Disks have only one set of R/W Heads – Arm?

I just started wondering, why should hard disks have only one arm for R/W heads. I did not try doing much research yet, but I think the technology today is mature enough to have more than one arm, thus improving the disk response.

One obvious challenge is the chances of disk crash will be doubled if we have two arms. Probably, the life expectancy also is cut in to half. But can the technology today take care of these challenges? Is it worth it? I am still trying to dig.
More to come…

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