re-mount ejected SD card without reinserting 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.

Thanks
On Mountain Lion with built-in SD readers:

sudo kextunload -b com.apple.driver.AppleSDXC
sudo kextload -b com.apple.driver.AppleSDXC