Review on 💾 MDD - Renewed HGST Ultrastar 6TB 7200RPM HDD with 128MB Cache and SATA 6Gb/s Connection - 3.5-inch Enterprise Hard Drive for NAS, Desktop PC, Surveillance Storage - 5 Year Warranty by Park Chong Hyun ᠌

Of the 13 purchased disks (I use in NAS DS 2411+), one died after about a month of operation - it simply ceased to be detected by the system. Was returned under warranty. The remaining 12 pieces worked fine until recently. In January of this year, the SMART of one of them deteriorated in terms of the 197,Current Pending Sector Count parameter. After about two months, on two more disks, the same parameter began to deteriorate. The remaining 9 pieces are still working flawlessly. I contacted the online store where the discs were purchased - they asked me to send them, if the problem is confirmed, they promise to replace or return the money.