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I have fifteen of these drives installed in three separate NAS devices. I purchased two of these 8 TB drives to upgrade my memory capacity in one of my Digital Robotics (Drobo) NAS devices. These two drive units have been in use for about three weeks. As I understand it WD began offering these "RED PRO" drives specifically for a RAID application (my Drobos are) From the WD information - "Since your NAS system is always on, a reliable drive is essential. With an MTBF of up to 1 million hours, the WD Red Pro drive is engineered to tackle 24/7 environments." I am a small tax practitioner and need reliability for all of my backed up files.
I do have one important consideration. WD warrants these drives for five years. Unless their warranty policy has changed, a customer would be expected to return a defective drive to WD for testing and evaluation to confirm that the failure was within their warranty clauses. However, I am NOT going to send in one of my drives with some extremely sensitive tax client information just to have it replaced under warranty. However, I did have had one fail several years ago. I contacted Western Digital Customer Service and explained the situation. I was provided with a "Confidentiality Waiver" to complete. I submitted it to WD and the drive was replaced under warranty.