I have never tried "CHKDSK / R" on a 2TB disk before, and I was curious to see how long it would take, and whether it would be successful. Luckily, where I live is not subject to power failures; if there had been one during the 6-day CHKDSK, that might well have resulted in the loss of all of the data.
The disk-check program that I have is "DiskCheckUp" version 3. It does display SMART data, but I am not convinced by it. There is one datum that is displayed in red ("Raw read error rate"), but the status displayed for that datum is "OK".
I am currently looking at how to re-organise my data, and have been looking as NAS systems. Although they can offer protection against disk failures, they seem to do so by storing data in a proprietary form, so that in an "emergency" it is not possible to remove a disk and connect it directly to a Windows PC. Also, most NAS do not seem to support true low-power states (i.e. hibernation). I want a system that will automatically hibernate if it has not been used for (say) 10-15 minutes, and then wake up in response to a magic packet over the LAN. That is why I have returned to looking at a drive-pool solution implemented on a normal Windows system acting as a server. That gives easy expansion by adding another disk, but every disk can be accessed individually if necessary.
-- from CyberSimian in the UK