I'm not sure how well or not 1 1/2 years is for a hard drive in these things. My analog drives never crapped out on me. But the seagate 3tb drive in a clients nvr died last night. It threw a bunch of disk error emails to let me know though, which was cool. This was the original drive that came pre-installed. A month ago I put in a 4tb purple drive and that drive is doing great thus far. The client is getting a second 4tb purple drive that I'll install and then he should be all set. Hopefully the drives last longer than the seagate, that's for sure. The drag of this seems to be that with a dahua, [possibly other brands as well?] when the current drive that's writing goes dead, it doesn't auto switch to your other drive. It drags the system down. I went there planning to try and reformat the drive but it literally kept the nvr from booting up properly after an attempt- black screen. Only when I unplugged it did the unit come back up and switch to the other drive. There should be a way to either remotely or locally switch drives and turn one off in the interface or software. I don't see any way to do that. So when a drive takes a dump, it really creates a problem until it's worked out locally under the hood. Unless I'm missing something... Anyway, long live purple drives...I hope!