Assume that a drive is encrypted by BitLocker on a computer that is running Windows 8 or Windows Server 2012. When you run Disk Defragmenter on the drive, the computer may crash. Additionally, you receive the following error message:

STOP: 0x00000019 (parameter1, parameter2, parameter3, parameter4)


  • This issue occurs more frequently when the drive is also configured to use the Storage Spaces feature.

  • This Stop error describes a BAD_POOL_HEADER issue.

  • The parameters in this Stop error message vary, depending on the configuration of the computer.

  • Not all "Stop 0x00000019" errors are caused by this issue.


This issue occurs because the BitLocker driver (Fvevol.sys) does not correctly allocate the size of an output buffer in an I/O request packet (IRP). Therefore, the Classpnp.sys process tries to zero out the output buffer incorrectly.


Update information

To resolve this issue, install update rollup 2883201. For more information about how to obtain this update rollup package, click the following article number to go to the article in the Microsoft Knowledge Base:

2883201 Windows RT, Windows 8, and Windows Server 2012 update rollup: October 2013


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, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

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