DC2GD: Dell 22TB 3.5in HDD WD WUH722222AL5200

DC2GD is a Dell 22TB 3.5 inch HDD built by WD as model WUH722222AL5200, formatted 512e, with firmware WS03. Dell supports DC2GD in MD1400 and MD1420 storage enclosures, and it is not self-encrypting (non-SED).

Western Digital's model-number scheme reads WUH722222AL5200 as a helium Ultrastar at 7,200 rpm and 22TB, with a 512e SAS 12Gb/s interface (52) and Power Disable pin 3 support (0). It belongs to the Ultrastar DC HC570, a 10-disk conventional-recording design in the 3.5 inch form factor.

HC570 uses OptiNAND technology, which adds embedded flash to the disk media so the ArmorCache feature can keep write-cache performance while protecting data in an emergency power-off. Other features are the eighth-generation HelioSeal helium design, ePMR recording and a triple-stage actuator.

The SAS drive has a 512MB buffer, 4.16 ms average latency and a 1200MB/s maximum interface rate, with sustained transfer up to 291 MB/s (277 MiB/s). MTBF is projected at 2.5 million hours with a 0.35% annual failure rate, workloads up to 550TB per year are supported, and the drive draws 9.6W under random 50/50 read/write and 6.0W idle. It is 26.1 mm high and weighs up to 670g.