title: sdcard in android studio emulator not know
body: <p>i'm beginner in android developing, many days i had problem with emulator-x86 in android studio and read many document for this problem, finally i found that this issue (slow emulator or not apear screen) was because my graphic display driver is PnP and i'm need to install company's version driver, not windows version!</p>
  
  <p>but, i'm have new challenge!
  i'm define sdcard in AVD Manager in android studio and run emulator, but emulator don't know sd card after boot!
  i'm even make new sdcard (mk sdcard) and run emulator by that, but dose not work this, too.</p>
  
  <p>are you have any idea?!</p>