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Consider the following scenario:

  • You have a Linux virtual machine that runs on a Hyper-V host in Windows 8.1, Windows Server 2012 R2, Windows 8, or Windows Server 2012.

  • You try to format a Linux file system (such as by using the mkfs command) that is larger than 2 terabytes (TB) in the virtual machine.

In this scenario, the format operation fails, and the file system is not usable.


This issue occurs because Hyper-V does not update the sense information correctly for the WRITE SAME SCSI command that is issued by the Linux virtual machine.


To resolve this issue, install the update rollup that is dated November 2014 or December 2014.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about software update terminology, see the Description of the standard terminology that is used to describe Microsoft software updates.

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

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