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app to mount micro sd card as drive letter?

Check to see if you have USB debugging enabled (Settings/Applications/Development). If USB debugging is enabled, plugging your SGS2 into a PC should create two drives -- one for the phone's internal memory, the other for the micro SD card.

If USB debugging is disabled, the phone acts as a MTP device, which a Windows PC won't recognize unless the MTP drivers are installed.
 
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