Recovering deleted digital pictures from the microSD card (FAT32) in the Sony Ericsson Xperia Arc S (Android) smartphone | Joachim De Zutter
On the smartphone go to Settings - Connectivity - USB connection mode, set it to Mass storage mode (MSC) to enable USB Mass Storage.
Install the free version of Zero Assumption Recovery (ZAR) on a machine running Microsoft Windows.
Connect your smartphone to the USB port of the machine, then follow the step-by-step instructions for digital image recovery to undelete your digital pictures to your hard disk drive.