About memory card data

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Hello sir
i want to talk about my memory card .it is full 10 gb .when i attached with computer its show 10 gb in properties but all folder are not showing only near 2 gb data folder is showing.nohidden file is showing .i also used option of showing hidden folder from organize.when i search in search box.folder show but only that i put name .. normally i am not able to open it .