I have tried googling it but couldn't find it. I know the command for it is cd /media for linux but have no idea what it is for Windows.I also tried the dir command but couldn't find anything related to media or usb.
You can access the USB drive by its drive letter. To know the drive letter you can run this command:
C:\>wmic logicaldisk where drivetype=2 get deviceid, volumename, description
From here you will get the drive letter (Device ID) of your USB drive.
For example if its F: then run the following command in command prompt to see its contents:
C:\> F:
F:\> dir