To equip my QNAP NAS, I ordered two HDD Western Digital. One of them works perfectly, the second met a concern. I inform by email Amazon and receives in a day Response Bora Computer, products provider: either it makes an exchange with refund of my job referral fees, a new copy is returned to me. Indeed, having received by returning the defective HDD Germany, Bora Computer sent me the new in two days. Installed on the NAS works flawlessly and I could configure my RAID. Here is an exceptional after-sales service and becomes too rare ... no vain discussions, a choice of decision given to the customer. Amazon selects suppliers that offer more than a product: service and listening. What a pleasure to work between professionals :-)!