Turn on or turn off USB mass storage mode

If your BlackBerry smartphone is connected to your computer with a USB cable but doesn't appear as a drive on your computer, you may have to turn on USB mass storage mode.
  1. On the home screen or in a folder, click the Options icon.
  2. Click Device > Storage.
  3. Press the Menu key > Enable USB Mass Storage.
  4. If necessary, type your smartphone password.
Your smartphone appears as a drive on your computer.

To turn off USB mass storage mode, press the Menu key > Disconnect.