http://blog.synchack.com/2012/03/sdorz_16.html

result.txt

XOOM (Android 4.0.3)
path : /mnt/sdcard, desc. : Internal Storage, Removable? : false, Emulated? : true
path : /mnt/external1, desc. : SD Card, Removable? : true, Emulated? : false

Galaxy Nexus (Android 4.0.2)
path : /mnt/sdcard, desc. : 内部ストレージ, Removable? : false, Emulated? : true

Acer ICONIA TAB A500 (Android 3.2.1)
path : /mnt/sdcard, desc. : 内部ストレージ, Removable? : false, Emulated? : true
path : /mnt/external_sd, desc. : SDカード, Removable? : true, Emulated? : false
path : /mnt/usb_storage, desc. : USBストレージ, Removable? : true, Emulated? : false