Just bought a pair of 1.5TB drives to set up in a RAID 1 configuration on my DNS-323; everything seemed to be OK (disk check etc) until I tried copying over about 1/2 TB of files from my other DNS 323 and I got the error message that there wasn't enough space available on Volume_1 (needed an additional 287 GB).  So I checked admin and it is showing -1MB as the capacity and 0MB of unused space.  Physical disk info is reporting correctly.
I was able to copy a smaller amount of files over (1/8 TB) - at least I started copying, I'll find out in a few hours if it was successful.
Should I return the drives or is there some way to get them to work?
Thanks
Dave
Western Digital 1.5TB Model WD1501FASS-00W2B HD
HARD DRIVE INFO:
Total Drive(s):    2
Volume Name:    Volume_1
Volume Type:    Standard
Total Hard Drive Capacity:    -1 MB
Used Space:    0 KB
Unused Space:    0 MB
PHYSICAL DISK INFO:
Slot   Vendor   Model   Serial Number   Size
Right   WDC   WD1501FASS-00W2B   xxxxx   1500 G   
Left   WDC   WD1501FASS-00W2B   xxxxx   1500 G