Recording facility

I register complaint to Videocon that my box had some recording problem. The Engineer came to home and started format my 16gb USB he format for half an hour but it doesn't formatted.Then he took his 8gb USB but it formatted.Then I took my USB and go to format but it didn't formatted.Engineer told me that it become complaint when I connect to my pc it is working.Why my pendrive didn't formatted.Please help me my dear Vadi Bro