Can't use Two My Passport Essential at the same time

I Have two WD My Passport Essential (WDBACY5000ABK-PESN) both 500Gb. Both work fine when used one by one but when I hook up Both at the same time the second one not appeared at my computer, althogh both drive powered on. I have tried different USB port and different system but always same result. My operating systems are Windows 7 Ultimate on Dell Studio 14 and Windows 7 Home Premium on HP dv4 laptop.

Please Help me!



Windows uses a unique identifier called a disk signature to tell one drive from another.

If both drives are the same make, size and type, chances are they will have the same disk signature.

I was unable to connect two My Book Essential drives to my PC at the same time for this reason.

How to Fix the Disk Signature Collision Problem in Windows 7 Windows 7 comes with a command line utility called diskpart that can let you view and change the disk signature.
Open a command prompt as administrator. To do this in Windows 7, click the Windows start menu (the round Windows icon on the left bottom corner), type “cmd” (without the quotes), right click the “cmd.exe” item that appears at the top of your menu, and click the line “Run as administrator”. Do this even if you are already logged in as administrator, since on Windows 7, administrators run with reduced rights by default.
A black command prompt window will open. In Windows 7, the title bar of the window will tell you that you are running it as Administrator. If it does not, it means you did not do what I just said above. Return and follow the first step, or you will not be able to successfully carry out the rest of this tutorial.
Type “diskpart” (without the quotes) into the window. (Note: for this and the other commands described here, you’ll have to hit the ENTER key after you finish typing your commands for them to take effect.)
Microsoft DiskPart will start. When it is ready, it will issue a “DISKPART>” prompt, allowing you to enter your commands.
Type “list disk” (without the quotes). This will list all the disks that are currently mounted (connected to the system). The disk will not have the usual names and labels that you’re accustomed to from the Windows Explorer interface, so you will have to recognize them by their sizes.
Note that “list disk” actually lists the physical disks, and not the partitions that you may have assigned drive letters. This means that if you have 2 physical disks, with 3 partitions on each, so that you have drives C:, D:, E:, F:, G: and H:, “list disk” will only show “Disk 0” and “Disk 1”.
To view the signature of a disk, you must first select it. To select a disk, type “select disk x” (without the quotes) where x is the number of the disk from your “list disk” display. When you type (say) “select disk 1”, DiskPart will respond by telling you “Disk 1 is now the selected disk”.
Now type “uniqueid disk” (again, without the quotes). DiskPart will respond with the disk’s signature, a series of hexadecimal digits (or at least I think it’s hexadecimal).
To change the signature to some other number, type “uniqueid disk ID=[NEW SIGNATURE]” (without the quotes) where “[NEW SIGNATURE]” stands for the new identifier you want for the disk (without the square brackets and without the quotes). However, before you do that, you may want to type “help uniqueid disk”, which will give you more information on how the command works. You may also want to find out the disk signatures of your other disks on your system before you modify your current one so that you don’t cause a new signature collision in trying to solve your current problem. In addition, if you’re really not sure how many digits you should give your disk, perhaps try changing only one digit of the current signature (eg, increasing or decreasing it by 1). Remember my disclaimer above: I really don’t know what I’m talking about here: do it at your own risk.
To quit DiskPart, type “exit”. Incidentally, in case you get lost while running DiskPart, when you are at the “DISKPART>” prompt, you can type “help” to get a list of commands. Typing “help” followed by the command typically gives you more info about that command.
Once you’ve quit DiskPart, type “exit” again to quit the Administrator Command Prompt.

Hope this helps.



you can try right clicking on my computer and then manage then disk management… Then look for the drive that is not showing then right click then click “online” so you can see it :smiley: had that issue the other day too XD


KanJinn wrote:

you can try right clicking on my computer and then manage then disk management… Then look for the drive that is not showing then right click then click “online” so you can see it :smiley: had that issue the other day too XD

 You may also need to assign it a different drive letter in Disk Management.


Thanks for Help, Problem Solved.

Thanks For Help. I used both method and they are working.

Got same problems.

Will try and see if it works.



 Yup, same thing happened with me so here is the quick answer.

Just check to see if the disk is formatted, the pasports useually are NTFS which is what you want for 99 99/100% of the time. To chck that just drag a file on the disk and list it or open it.


Control panel > Computer Management > disk Management

Assign another dive number like J or P to one of the disks. (one of them is probably F:). It’s some where in there in disk management under actions. the drive number will switch right away you will see it under “Computer” listed with the new drive number.

In the Disk Management the second disk will show “Off Line” with a signature error, Just Click it to put it online and you are done.

It should say [Simple Basic NTFS Healthy (Primary Partition) 931.48 GB] for a 1TB drive

Right Click on the drive Icon under "Computers and clik properties and put a “Name” on both of the disks so you don’t go “CRAZY”, OK?

Good Luck!   :-})