I use a microSD card in my macbook air for additional storage, using a flush adapter (homemade, similar to the nifty minidrive).
To save battery when I'm not using it, I disabled auto-mount using /etc/fstab. But sometimes, I accidentally eject it instead of unmounting (because that's what the finder gui does).
After it's ejected, the only way I know to remount is to take the card adapter out and put it back in. Since it's flush, I need a paperclip to take it out.
So I need a way to re-enable the card reader without having to re-insert.
In Windows, this is possible using the devcon command-line tool from microsoft, or going to device manager, disabling and enabling the card reader.
There has to be a way to do this, so please don't answer just saying it's not possible.