Hello rajuuv,
Welcome to Tom's Hardware forums!
1. Try this USB drive in a different USB Port of your PC.
2. Also try on a different PC
3. Does this USB Drive show in Disk Management (Right Click on Computer >> Manage >> Disk Management). If it shows here, this should have a drive letter assigned to it. If there's no drive letter assigned, you need to assign one.
Thanks!
Merry Christmas!!