how to format Trancend

Plug it in, let it be detected as an external HDD.
Right click on the icon in My Computer, in the drop down you will find a Format option. Click on it, a new window will pop up, choose the file system, usually NTFS these days and then a Label for the drive, Tick Fast Format or Untick Fast Format depending on the amount of time you want to wait for the format process to take and click ok.
The format will begin, just make sure you or any other application is not sing that drive or you will get a message saying , Unable to Complete format.

Or
Plug the drive in see what drive letter is assigned to it.
Open the Dos Command Prompt.
Type in at the prompt> Format (Drive letter for trancend drive):
Without the brackets press enter and it will ask you to confirm, click Y and continue to wait till it finished the format process.