I had bought in shop not from roadside as you said, please give some suggestions regarding this

Yes, it is new pendrive. I had formatted earlier the same as you said. but the result is same.

Thank for responding, the message is unable to copy,it is a single file.

Dear Sir/Madam, I (srinivas) bought a 8 GB sony company pendrive. I am unable to copy 4gb data. Please help me how can i copy the same. Srinivas