Would using Red drives make sense for a 5- or 6-drive RAID array where each drive is plugged directly into the PC's motherboard? My objective is capacity and longevity (i.e., I don't want drives failing after a year or two), not speed. I still haven't decided between on-board hardware RAID or Windows soft RAID. My current setup uses 5x green-type drives (from mixed vendors) in an external RAID enclosure, and I'm very worried about the drives starting to fail. Plus I'm looking to get rid of the enclosure itself.
I think the Red drives would make sense for a RAID array of that size, regardless of where they are plugged in, at least according to the technical aspects of the drive WD is marketing.
However, I would be nervous about setting up a RAID with all Red drives because they are so new. All the fancy features are great on paper, but real-world stats on their longevity are not available yet. By having all drives of the same type, you increase your chances of a systemic failure of that model killing off multiple drives in a time period that is shorter than your ability to replace the drives.
My vote would be to continue your path of utilizing drives from different manufacturers, or at least drives that have been manufactured at different times.
As for RAID type, hardware RAID can be more portable and sometimes better performance, but Windows RAID can be very portable as well between Windows OS's. I personally use ZFS, so all for software RAID. Having extra hardware just gives another component to fail, and software RAID can actually be faster.
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