Well I did install the drivers, though those are optional, and what changes is that instead a power up issue, now the drive power ups correctly, but now randomly switches off completelly.
So called the WD support. First they suggested a firmware upgrade, which actually is irrelevent as the drive allready runs the latest firmware as confirmed by the tools. So called them again and they could not provide any solution but either to escalate and investigate or to replace the drive (and actually get an refurbished one). As I do not believe it is a HW issue - as the drive functioned properly under 10.6, I opted for escalation and here am I waiting what happens…
