Well if you had adb enabled then use that, I don't know the mount commands....or if you have a costom recovery you can mount with that
Sent from my AT&T Samsung Galaxy SIII using the XDA-Developers App
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Current Device: Samsung Galaxy SIII (SGH-I747)
ROM: Stock Touchwiz Rom
Kernel: Stock 3.0.31-2024954
Previous Devices: Motorola Droid 1, Pantech Crossover, Motorola Droid X, LG Revolution, Sony Ericsson Xperia Play (r800x)