Had the same problem about 2 weeks ago.
Tried everything I can think of - plug the HDD to other PCs, change USB cables, plug to different USB port (directly)…
Nothing works !!! non of the PC is able to recognise the HDD.
This morning, my colleague faced the exact same problem with her HDD (same model) which we purchased at the same time.
so I called up the support hotline … this is the response I get :
“Sorry sir, your hard disk warranty expired on 23rd April 2014, we will not be able to replace the hard disk for you.”
PS. warranty was based on manufacturing date as I wasn’t able to provide the purchase receipt.
When I ask about what WD will be doing to resolve this problem, the lady just say “we will feedback to the company”
All the while, my thoughts on WD hard disk was that they have very reliable products. BUT… after this experience,
My confidence in WD products have dropped to ZERO!