WD MY passport problem | I can't open it TT,,TT

Firstly, I bought it today and I have informed that, if I wanna use it in MACBOOK i have to format it (I’m Mac User) so before I format I open the the drive to see does it has anything inside so I could copy all of it but when I open inside it has only one folder and don’t have any file so I didn’t care about it.

so I format by open Disk Utility > Erase > Change it to be MS-DOS (FAT) so after it finish I reopen the drive and then it’s empty, I wanna create new folder but it’s can’t so I unplug it and plug it again, then it come up with some kind of error box message, but I don’t care that much, then I found out that the drive hasn’t show…so I would like to know what should I do now?? Am I do something wrong??

I don’t know about Macs maybe this will help in case you missed a step http://wdc.custhelp.com/cgi-bin/wdc.cfg/php/enduser/std_adp.php?p_faqid=3865