WD Ext Hard drive model number and specs?

hey all,

I have a WD ext hard drive, WD P/N: WD1000H1C8-00. I have no idea of model number and Im trying to find specs on it. I bought it a few years ago now to use with my Windows based laptop. I am now going to mac and want to make sure it is compatable. I see it has a small usb, 2 FireWire, and eSATA outputs. I am NOT computer savy.

Which will be the best conection for iMac if possible to use?

Will it be USB 3 speed??? (what ever the **bleep** that means lol)



This drive has usb 3.0 http://support.wdc.com/product/install.asp?groupid=129&lang=en .

This is 2.0 and 3.0 http://support.wdc.com/product/install.asp?groupid=130&lang=en .

This has 2.0 and firewire http://support.wdc.com/product/install.asp?groupid=126&lang=en .