I have a WD My Passport Essential USB3 external hard drive.when it was connected to the laptop, my system went into Sleep Mode and I just got separate hard drive from the computer … Now the hard is not recognize to every system that I connect and the SES driver cant be found. despite announcing hard is coonected throw usb and it is seen as Disk2 Disk Management , it is not dedicated a letter and it is not seen as a partition in My Computer. I downloaded WD SES USB Device Driver and installed it but I still connect the drive WD BAD PCB USB Device install and the system during installation writes WD SES USB Device Driver not found. please help me 
Hello, try adding the drive letter manually. Check the link below for the steps.
How to change the drive letter assignment in Windows 8, 7, Vista, XP or 2000
Thanks, but it doesn’t work for me. My problem is related to WD SES USB Device Driver!
there isn’t anyone help me?
Hi again. Check below for some troubleshooting steps you can try.
1-Run a test using DLG, this will rule out any hardware problems.
How to test a drive for problems using Data Lifeguard Diagnostics for Windows
http://wdc.custhelp.com/app/answers/detail/a_id/940
2-Be sure to use the USB cable that came bundled with the Passport, avoid using extension USB cables or USB hubs.
If the problem continues the data inside the Passport might be corrupted, if you need to recover your files try using a data recovery program, using Google you should be able to find several options. If you don’t need to recover your files, format the Passport from the disk management window. Check the links below for more information.
How to partition and format a WD drive on Windows (8, 7, Vista, XP) and Mac OSX
http://wdc.custhelp.com/app/answers/detail/a_id/3865
WD Data recovery Partners.
http://support.wdc.com/recovery/index.asp?wdc_lang=en
Hi
I checked it with another cable but it doesn’t work. I connected another Passport to my laptop and it worked correctly. About DLG test, it’s not available in WD DLG SMART Status and writes zeros failed, and also It can’t be initialized in Disk Management . So is it a hardware problem and I need to take it for repair?
