New hard drive not recognized

My Ex2 Ultra will not recognize my two new wd red plus 10Tb hard drives. My older EX2 DOES recognize the same exact new hard drives. I even bought a new EX2 Ultra with OS 5 pre-loaded and it does NOT recognize the new hard drives. I have tried the 10 second reset and the 40 second reset on the EX2 Ultra with no success. Any idea what to try next? Should I just give up on my both my EX2 Ultras and move to Synology?

Further information would help:

  • Do the drives spin up after you power on the device?
  • Do you see any particular lights on your device?
  • Does it say anything specifically on the disk status page?

Have you tried contacting WD directly?