WD30EFRX problem after using on Synology NAS

Have a problem with the right disk size of my two WD30EFRX disks that I had in my Synology NAS (Hybrid Raid). The disk size was 3TB, but when I look in the Disk Utility software on El Capitan (connected via USB) I see only 801GB disk size.

Can you advise me, what to do?



What happens is you connect the drive on a different device? If possible try this out to see if the same size is displayed.