Hi guys,

I plan to Format a 2TB 3.5" HD from an External Enclosure connected to my Laptop via USB 2.0 Port.
I think a Full Format will take around 20 hours with my setup, I could be wrong.

While the HD is formatting, is it safe for me to open and browse the internet or watch a youtube video? Will that be a risk that the Format of the HD will be less reliable?
Does Formatting a HD take a lot of PC resources, Memory Usage and CPU Usage?

Thanks for your time.

No it doesn't, you should be fine doing all those things, though windows has a lot going on, I wouldn't be doing unnecessary things. . The part to be super careful about is to not knock the USB cable.

Thanks HaQue.