Hey there, Garov!
I wouldn't really recommend you the WD Green HDD for your laptop if it's going to be your primary OS drive. The WD Green HDDs are designed to be used as secondary storage or backup drives in external enclosures. They run cool, quiet and deliver massive capacity for your data, so they spin down regularly due to these power-efficient features. Though I would definitely trust my massive files with the Green HDD, I wouldn't put the operating system on it.
I'd recommend you to take a look at all the internal 2.5" mobile HDDs that WD has and decide if you really need the 2 TB Green:
http://products.wdc.com/support/kb.ashx?id=lEw7vf
If it's going to be the only drive in your system, I'd suggest you to take a closer look at the newest WD Blue Solid State Hybrid Drive (SSHD). It unites both a high-performance NAND flash SSD tech with a massive HDD storage to enhance the performance and computing experience. The 2.5" version of the WD Blue SSHD comes only with 1 TB storage capacity though. You can more of its features here:
http://products.wdc.com/support/kb.ashx?id=n6TpID
So what do you need those 2 TB for?
If you have any questions whatsoever about any of the drives above, feel free to ask!
SuperSoph_WD