Windows assigns new drive letters to the next available physical drive. It will sometimes take the same drive letter as a network drive for this reason. This is a common problem with removable storage devices. Please use the following procedure to resolve this problem.
FAQ: KFR-011411-GEN-01
This is due to a power limitation. Though some USB devices may work fine in these USB ports, USB 2.0 High Speed devices usually require more power. In order to resolve this issue, you will need to insert the reader directly into one of the main USB ports. These USB ports are usually located in the back of the tower.
FAQ: KFR-011411-GEN-02
FAQ: KFR-032312-MLG3-01