What's the longest-running HDD you have???

[LongRunner]

A DTLA-307020. With no bad sectors.

[LongRunner]

...ST3120026A...no CRC errors...

Now there are six of them, but that's because I connected it with a 40-wire cable to deliberately limit the interface speed to test its efficiency (in terms of raw bandwidth compared to actual data transferred), and although the hosts are designed to restrict the speed when running with a 40-wire cable, they apparently don't limit it enough. Still flawless otherwise.

Also, I figured out how Samsungs report their runtime and updated the original post.

[LongRunner]

For once in a lifetime...

[LongRunner]

Update: As I have seldom used my ST3120026A, one of the WD800JD-00LSA0s in my older system has overtaken it in runtime, with 37,230 hours as of now (though only 728 start/stops). The other has 32,128 hours and 1,375 start/stops. S.M.A.R.T. records on both are clean save for one UDMA CRC error each.