if you do a long listing ("ls -l") of /dev and grep for the block major number
mentioned in the 'notification' message (it isn't exactly an 'error' message),
you'll probably get a good idea which driver is being modprobe'd for a device
you don't actually have installed.
viz: the message says "can't find block-major-7", so you check up on
this with // ls -l /dev | grep " 7," // (the stuff between the double slash chars)
You can do a quick check of the block major numbers of all active devices
and drivers by doing "cat /proc/devices".