For me it was working successfully. - But after disk scan, the DNS-323 showed me that both harddrives where formated.

I made a restart of the whole device. After this the data "HARD DRIVE INFO" was shown correctly in the status window.
Slot Vendor Model Serial Number Size
1 SAMSUNG HD642JJ S1AFJ9BQ906481 640 G
2 SAMSUNG HD642JJ S1AFJ9BQ906477 640 G
EXT2
RAID0