Hi, Am wanting to get the various VMs that are clogging up my internal drive and put them on an external. I have a mid 2011 iMac and am wondering if FireWire would be acceptable speed wise. My VMs are windows 7 and soon to be Windows 8. I don't run heavy apps on them, mostly web browsers and some accounting software. Thunderbolt is still too pricey so hopefully usb2 or FireWire will be ok. Thanks.