Some people are having HDD problems...
...but fortunately, mine has been working fine. I think that a certain percentage of gadgets are always going to have problems.
I would hope that if a company was putting a HDD into a mobile device, they would have done some testing to make sure it would hold up, but who knows. Anyway, I didn't have much choice since I wanted something to hold all my music, and this is the only one that would do it. At this price, and with new tech coming all the time, I don't expect to be using the A70 more than a couple of years; hopefully, the HDD will hold up that long.
This reminds me of a conversation with my brother -- I had just bought a 70" DLP TV and he bought a plasma. When I said "The DLP will last a lot longer," he replied that he didn't WANT his to last too long -- he wanted it to break down about the time something bigger and better came along.