Where are you getting that Blacks are less reliable? Everywhere I have read and seen blacks are more reliable including WD's own specs. While yes reds are better for long term storage and NAS duties at 24/7 because they are cooler and have more load and unload cycles,
I am under the impression that the point of the various Reds was they slowed them down and reprogrammed them to be more reliable for 24x7 operation. WD wont even publish MTBF and AFR stats for blacks, the only true measures of reliability. If you can find MTBF and AFR for Blacks, please show me.
These stats are published for Reds. Why wont they publish the stats for Blacks? Kinda fishy to me.
Everything I read says use Red models over Blacks for RAID/NAS.
Reds also have a longer park time setting, quick park times cause wear among other things.
For WD drives there is an application wdidle3.exe to read and set park times.
I have read Blacks park to quickly too, here is a snippet that explains the benefits of setting this on non Reds to act more like Reds:
(Article uses Greens as an example)
In order to minimize energy usage, WD Green disks are configured to very aggressively park the head of the disk: this happens after 3 seconds. That setting is OK if you're using this as your OS disk, because disk usage tends to be grouped in peaks. This setting is fatal for a disk if it gets used in a server. Disk usage on file servers is much wider spread, causing the disk heads to move
a lot. So much so that some bits of plastic will wear out in the first year. WD Reds wait much longer to park the disk head, eliminating this issue.
Fortunately for us, there is a tool that allows you to set this value yourself. On windows this a tool released by WD themselves: wdidle3.exe
On Linux some folks reversed engineered this and released it as idle3-tools.
I'm from the school that you leave electronics on all the time, especially a NAS you may access at any time of day or night. The various Red drives are supposedly better for that, so that's why I prefer them. You may prefer a little more speed and non 24x7, that's OK too.