ST2000DL003 Barracuda - 2TB

Hello, I have 5 2TB Barracuda's and 1 Samsung HD204UI ready for installing to my Readynas Ultra 6. The first time i put them together in my Nas and the boot find all 6 of them. Then c: was resynking. when ready it started restriping and after a while! Disc error disc 2. Frontview log warning disc 2 had 6 ATA foulds and system crascht and could not get acces to drives and backup information. System reset to factory boot and try again with first 2 Barracuda's, while checking discs again warning disc 2 error ( 6 ATA's broken ). Back to the store they check the drive and Yes!!!! 1 Barracuda broken after 2 days trying setup my Readynas ultra 6. This is the first time this happens with one of my drives. Now installing with other 4 Barracuda's and after 7 hours restriping i have now 37,0 %, but i don't know if i have to wait until the nas is ready with the 4 drives now, ore can i put in the new Barracuda and the Samsung immediately now without any problem. BUT after All, The Seagate ST2000DL003 is still one of the Best HDD on the Market.