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WD owns HGST (former Hitachi and IBM drive operations), and WD Gold drives (at 8TB and up, not sure about smaller) are mechanically HGST enterprise Helioseal drives. The Gold 12TB is mechanically the HGST Ultrastar DC HC520 (Ultrastar He12). The Gold 12TB electronics might or might not be the...

Yes, the WD Gold 12TB does preserve the ERC setting across power cycles. I'm using nine of these drives on a file server running CentOS 7, with three of the drives in a ZFS mirror, and six using ext4 and SnapRAID. I've had to power-cycle the file server more times than I'd like, due to problems...

The WD Gold 12TB drives (WD121KRYZ) with version 01.01H01 firmware (AFAIK, the only released firmware version to date) definitely do have ERC. They default to having ERC turned off, but you can turn it on with smartctl. % hdparm -I /dev/sdr /dev/sdr: ATA device, with non-removable media...