WD10EARS Caviar Green, PC cannot find it

Hello,

I needed to remove my Caviar Green from my PC and I am trying to use it as an external drive. My old PC and my laptop run Windows 7, but the laptop cannot find the drive. I am using a SATA to USB adapter, no enclosure. 

Does anyone have idea what could I do to get to my data?

Thank you

Hello,

Is this drive formatted or not ?