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Pen Drive not working properly

I bought a pen drive from ACHATES SYSTEMS situated at Panipat.

This pen drive doesn't work properly and doesn't stores data.

But when i told this to that shop keeper, he told that its working.

but it is not working. The pendrive costs me Rs. 500/-

Shop Details are:

Achates Systems,

11-A, Near Deep Hotel, Bishan saroop Colony, Panipat-132103