Given: MacBook Pro, USB flash drive Conditions: 1. Plug flash drive into MacBook USB port 2. Open some documents from the flash 3. Leave MacBook until it goes to sleep Effects: When awoken USB is unmount and all opened documents are frozen. Have to unplug USB flash and plug in back again. Questions: Is it how it is supposed to be? How do you prevent USB from unmounting when MacBook goes into sleep mode?