Root Can't unmount /system

[Nimbus79]

Hey all... was messing with restoring the vanilla froyo lockscreen. I went into clockwork recovery, mounted /system and did my thing. I failed to type #exit prior to disconnecting the usb and attempting to unmount /system. Now I get this: Error unmounting SYSTEM: !

any guidence? I don't think a reboot is smart at this point. I remember reading that might brick me.

anyone remember the command to mount system?

thanks in advance