GoForSmoke:
1N400x datasheetFunny, I use them as if the band is at the end of the diode that current flows OUT (to GND) and it works. Note that current here is + charges.
As a rectifying diode yes, but as Back-EMF diode they need to conduct on the reverse polarity of the coil Back-EMF, and not conduct when the coil is being powered.
Tom... 