I am having a similar issue. It shows the pendrive but i cant find drivers
the lsusb shows;
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 006: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode)
Bus 001 Device 003: ID 1a2c:407e China Resource Semico Co., Ltd USB Keyboard
Bus 001 Device 002: ID 1bcf:0007 Sunplus Innovation Technology Inc. Optical Mouse
Bus 001 Device 005: ID 0bda:8176 Realtek Semiconductor Corp. RTL8188CUS 802.11n WLAN Adapter
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub