Hi there and welcome to the WD community.
You can format the drive by following the steps on this link:
http://wdc.custhelp.com/app/answers/detail/a_id/3865/
You may use the my book to copy your files manually, just as you would with any USB memory. For help on some of the basic uses, please follow the links below.
“How to move or copy files from one hard drive to another in Windows”:
http://wdc.custhelp.com/app/answers/detail/a_id/1198
“How to copy or move files or folders to a different hard drive on a Mac”:
http://wdc.custhelp.com/app/answers/detail/a_id/1199
