Comment # 4 on bug 1036463 from Franck Bui

(In reply to Lee Duncan from comment #3)
> Yes, the sg driver still needs to be loaded, by default, since it is used by
> udev as well as the sg3_utils package, which also seems to be installed by
> default.

Could you explain why the sg driver is special here and needs to be loaded
manually unlike most other drivers ?

Also how does exactly udev rely on it ?

Thanks.