the 2.2 update added a virtual hard drive to the card. what it does is just mount 'hard drive' that has the verizon sync stuff. all your doing is turning the visiblity off. if you want it back you do the same procedure and do enable.
the virtual drive is much like the ones that come on western digital external hard drive. basic crapware no one wants but they force on you and make you jump thru hoops to get rid of.