Support Galaxy S2 : no more access to internal storage

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http://androidforums.com – Hi, on my GalaxyS2 I'm no more able to access my personal data/folders located on /mnt/sdcard/ I only see 2 (empty) folders "external_sd" and "usbStorage". But I'm quite sure my personal data is still there, but it doesn't show up because access rights are gone ? - All the apps I previously installed (partially on internal storage) are still working - When I take a picture with the camera : no picture is stored on the device ! - When I check the storage parameters, I get 12 Gb USB storage free / 12 Gb total - Access from my PC : same result, only "external_sd" (General)