I bought a MacBook Pro last October, one of the deciding factors for me being the Thunderbolt ports. I noted that Apple offered adaptors for peripherals with other types of connection but thought I'd delay buying any of these for a while.
I'd now like to buy an adaptor to enable me to connect something with a USB cable.
Apple's USB–Thunderbolt adaptors are very expensive but I have found some adaptors that look suitable for under £10 on eBay. (There are also many non-Apple adaptors that are fearsomely expensive.)
Is there any reason why I shouldn't buy the least expensive USB–Thuderbolt cable I can find?
Could a cheap adaptor damage the peripheral or the MacBook?
Also, I am confused by the reference to USB a, b and c. Is this refinement I really need to get to grips with? and if so, how?