HDD WD BLUE 3TB 5400RPM SATA3(6Gb/s) 64MB 

HDD WD NB 2.5" 500GB 7200RPM SATA 64MB

HDD WD 2.5" 500GB  BLUE 5400RPM SATA 128MB 

HDD WD 6TB NAS Red Plus SATA3(6Gb/s) 128MB 5640RPM

HDD WD 3.5" 6TB BLUE 5400RPM SATA Cache 256MB

12TB Storage Capacity , 3.5" Form Factor , SATA III 6 Gb/s Interface , 256MB Cache , 7200 rpm , Up to 240 MB/s Sustained Transfer Rate , 1 Million Hours MTBF , 180TB Yearly Workload Rating , Air Sealed

8TB Storage Capacity , 3.5" Form Factor , SATA III 6 Gb/s Interface , 256MB Cache , 5400 rpm , Up to 202 MB/s Sustained Transfer Rate , 1 Million Hours MTBF , 180TB Yearly Workload Rating , Air Sealed

6TB Storage Capacity , 3.5" Form Factor , SATA III 6 Gb/s Interface , 256MB Cache , 5400 rpm , Up to 202 MB/s Sustained Transfer Rate , 1 Million Hours MTBF , 180TB Yearly Workload Rating , Air Sealed

4TB Storage Capacity , 3.5" Form Factor , SATA III 6 Gb/s Interface , 256MB Cache , 5400 rpm , Up to 202 MB/s Sustained Transfer Rate , 1 Million Hours MTBF , 180TB Yearly Workload Rating , Air Sealed

16TB Storage Capacity , 3.5" Form Factor , SAS-3 12 Gb/s Interface , 512MB Cache , 7200 rpm , Up to 262 MB/s Sustained Transfer Rate , 2.5 Million Hours MTBF , 550TB /jo Yearly Workload Rating

12TB Storage Capacity , 3.5" Form Factor , SAS-3 12 Gb/s Interface , 256MB Cache , 7200 rpm , Up to 242 MB/s Sustained Transfer Rate , 2.5 Million Hours MTBF , 550TB /jo Yearly Workload Rating

8TB Storage Capacity , 3.5" Form Factor , SAS-3 12 Gb/s Interface , 256MB Cache , 7200 rpm , Up to 230 MB/s Sustained Transfer Rate , 2.5 Million Hours MTBF , 550TB /jo Yearly Workload Rating