My Book Essential—WD software sees it, Mac doesn't

Hi guys,

I’ve had a My Book Essential 3TB drive for a long time. Last week it stopped showing up on my desktop—no software upgrades recently installed, nothing strange. In WD Discovery, the drive appears but there’s no information about its content. There’s only an option to reset or kill the password. I never added a password, so I can’t answer the cue for the current one. WD Utilities sees the drive, but can’t run any diagnostics.

Anybody run into this, or know how to reset the password… Without losing the data?