asicminer block erupter too many hardware errors

[ricardo.benin]

OK i just started bit coin mining for the first time yesterday , i am mining on my raspberry pi with a 330mh/s erupter and its displaying
A: 1k1
R: 2
H: 730

Why do i have so much hard ware errors ? is it due to not enough power ? i am not using a powered usb hub im using my usb port on my raspberry pi and its powersupply is a micro usb phone charger that puts out like 1amp i believe but it has to power other stuff that is on my pi so i was thinking its because of not enough power it shows it runs at 190mh/s but when i mine on my zenbook it mines at around 380-400mh/s

So really my question is what are hard ware errors from how can i stop them and what do they do ?

[ganabb]

Need more info , can you upload images.