Been using one of these Belkin powered hubs for about 3 years with no problem:
http://www.ebay.co.uk/itm/like/2909...ICEP3.0.0-L&ff14=122&viphx=1&ops=true&ff13=80
Connected to Printer, Scanner, Wacom Tablet & Card Reader.
Mine is USB2, used with 21.5" mid 2011 imac but now Retina Mac for past year. Does what it says on the tin.
http://www.ebay.co.uk/itm/like/2909...ICEP3.0.0-L&ff14=122&viphx=1&ops=true&ff13=80
Connected to Printer, Scanner, Wacom Tablet & Card Reader.
Mine is USB2, used with 21.5" mid 2011 imac but now Retina Mac for past year. Does what it says on the tin.