I recently bought a SATA Caviar Green WD series WD5000AZRX-00A8LB0, to be used as additional storage on my workstation (not as a system disk). Upon install it was instantly recognized, but then started to act strangely: three times out of four it was not recognized in BIOS and in Win7.
I tried changing MB connectors, S-ATA and power cables but still the same behaviour: sometimes it's detected and sometimes it's not. I tried scanning it with WD storage tools, but no errors showed up; and when it's detected it seems to run just fine.
I have an older Caviar Green (1TB) on the same workstation, running just fine.
What could it be? Is it a faulty drive?