Detect second disk on Windows Server 2012

Hi,
newly installed Windows Server 2012 R2 with two internal harddrives.
The two disks shows up in Disk Manager but only one in File Explorer.
How can i configure the server to expose the second disk in File Explorer?
/Roger

Hi Roger,
Has the problem been solved by online/initializing/assigning drive letter ?
Best Regards
Elton Ji
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    TechNet Subscriber Support
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    TechNet Subscription user and have any feedback on our support quality, please send your feedback
    here.
    Lawrence
    TechNet Community Support

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    This is vague on my part, because the exact nature of the incompatibility cannot be readily determined from the information available. 
    But the consequence is the same: the system cannot boot from the install disk, either for initial installation or repairs.
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    However, in order to perform a disaster recovery using Windows resources (such as image backups from Windows Server Backup), one would have to presumably boot from a Windows Server 2012 64-bit install disk or Windows Server USB recovery drive. 
    Of course we know that the Windows Server install disk will not boot and we can be fairly sure that the problem will migrate to any Windows Server USB recovery drive that is created. 
    My inspection of a Windows 7 System Repair CD shows that is based exclusively on boot.wim, not discrete files! 
    Of course a generated image for a WIM for Windows 2012 USB recovery drive
    might not have the flaw that drives this behavior, but it probably would.
    Problem conclusion:  A BIOS upgrade would be required for compatibility with Windows Server 2014 clean installation
    and any maintenance; and none is available from the OEM.
    Problem not resolved, but understood for future reference.
    Thanks to Tim whose comments helped me focus my thinking.

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