External Drive for my Mac

[Domo]

I have a Mac Book Pro Retina and only got the 256GB disk. Kinda regretting it now! But can I get an external disk with thunder port connection and run VMs directly off it? Will it be quick enough? Would I have to opt for SSD over HDD?

Advice welcome

 

[Domo]

Thanks guys - and yeah was looking at the 256GB LaCie with SSD. When is says USB 3.0 Thunderbolt does that mean USB 3.0 or Thunderbolt?

 

[Domo]

Can you put that into simple terms for me? Sorry!