
WD Red Plus
6 TB, 3.5", CMR
WD Red Plus
6 TB, 3.5", CMR
can be connected without any problems. Cache improves read speed. I don't know your raid, but I'm sure you can answer this question yourself. Otherwise, see also "Uwe's" post.
For home use with a few cameras, a Red is certainly sufficient, the Purple only has advantages if many cameras write to the disk and you often evaluate the videos. Both are suitable for continuous operation.