hmm dunno what happened but i formatted sd card using sdformatter, copied hyperdroid, music and media folders across and booted up into android. but i was greeted by a rather alarming notification :S "damaged sd card".
rebooted hoping this would resolve it but it popped up again. dont see how sd card is damaged if its managing to boot android from it?
ill start over and report back
Just put sdcard in card reader and it reads it fine so seems to be just in android.