  Hi Jaydeep,
Dear member of SanDisk Community, welcome.
Friend, test the pendrive in other PCs, to discard problems of your PC.
If still bad, do not grieve more, return it, because is dead.
Contact SanDiskTechnical Suppor__t who will replace the device, if it’s authentic and is within warranty.
Link: http://www.sandisk.com/about-sandisk/contact-us/
Luck.
Regards, Alfred.                                                          (Google translated)
