Windows Server Backup -- REFORMAT external hard drive ?

How can I do the below #3 ?

 1. external hard drive, worked fine,
    viewable in any Windows machine
 2. setup external hard drive to do
    Windows Server Backup test, worked fine,
    NO LONGER viewable in any Windows machine
    per Microsoft design
 3. want to reformat external hard drive
    so it can do above #1 again
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There are a few locations to look for the Drive. If i remember correct you can see the drive used for backups through the server the following:

Start > R-Click Computer > Manage > Storage > Disk management

If memory serves me right you will see the drive but without a drive letter associated, you can assign on here and format wipe as required.  If this is not the case try using the DISKPART tool from command line some of the basic commands are available on the following URL:

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noxchoGlobal Support CoordinatorCommented:
Windows Server Backup leaves the drive unmounted ( no drive letter assigned) after formatting it. It is done knowingly to avoid any other data writing to this drive. But the drive is already formatted. You need to assign a drive letter to it. Right click on MyComputer - Manage - Disk Management.
There right click on a partition on this drive - assign/remove drive letter - select one free and assing it.
This way you can see the content of the drive.
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Windows Server 2012

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