BUT:
Unfortunately, WD has scored a real buck with some 3 TB and 4 TB all models, which disqualified the plates without pre-treatment for 24/7 server operation: the so-called IDLE3 timer is set to 8 seconds, ie after 8 seconds of inactivity, the heads are parked , Since the 24/7 server operating very quickly access is typically, this very rapidly increases the number of parking cycles (the so-called. Load Cycle Count, LCC), with me about 600 cycles per day (the value can with SMART Tools be read). Extrapolated to the Park 600000 cycles for WD RED plates are designed, this means that after 2-3 years of the end of life has been reached and a defect of the panel is to be feared with data loss. While that is still in the three-year warranty, but there probably only part of the sold WD RED boards in fact, 24/7 operation is running, probably the most records will be broken only after the warranty period, so that the WD warranty no longer applies ( Evil to him who thinks evil of it).
REMEDY:
Remedy the tool WDIDLE3.EXE (DOS) or the idle3 tools under Linux (Googling), with which you can adjust or completely disable the IDLE3 timer to a reasonably high value. For instructions, there's plenty on the net.
Incidentally, it is not recommended to use the disk as Deskop plate, because the error handling is rated for operation in the RAID array, ie the drive will give up very quickly in order to enable the RIAD controller rapid Troubleshooting reading problems. Desktop drives (such as the also recommended WD Green) try very long data still save at reading errors, but in the RAID array is again poor because the RAID controller not so long waiting and the whole drive from the RAID multi-project takes.
CONCLUSION:
If one is willing to fix the IDLE3 setting, it is the perfect NAS drive. Since WD "runs into the trap" but with this setting many users (because the disk slowly dies), there's only three stars from me.