the volume C:\ is USB device and cannot be used

Hi

I'm trying to create a pre-staged media for Windows To Go via SCCM 2012

I followed this article http://technet.microsoft.com/en-us/library/jj651035.aspx and made all the steps.

I have a certified USB drive of SPYRUS. I managed to apply the prestaged.wim file on the drive and I can boot to WinPE and choose the Task Sequence.

when I get to the "Apply Operating System" step the TS fails with the 0x80004005

here's the part with the error code on the smsts.log

'C:\' not a removable drive
The volume C:\ exists and is a local hard drive.
interfaceType.compare_no_case(c_USBInterfaceType) != 0, HRESULT=80004005 (e:\nts_sccm_release\sms\client\osdeployment\applyos\installcommon.cpp,578)
The volume C:\ is a USB device and cannot be used.
ValidateVolume(volume, allowFAT), HRESULT=80004005 (e:\nts_sccm_release\sms\client\osdeployment\applyos\installcommon.cpp,647)
The requested target could not be resolved to a valid volume on this computer. Check your task sequence to ensure this drive is correct and that it is being created
The parameter is incorrect. (Error: 80070057; Source: Windows)
ResolveTarget( g_Target, g_InstallType == InstallType_DataImage, targetVolume ), HRESULT=80004005 (e:\nts_sccm_release\sms\client\osdeployment\applyos\applyos.cpp,483)
Process completed with exit code 2147500037
--------------------------------------------------------------
Failed to run the action: Apply Operating System. 
Unspecified error (Error: 80004005; Source: Windows)

logically - yes, it is a USB drive but the whole point here is to deploy an operating system on a USB drive.

I couldn't found any resources about what to do with this error.

I probably can disable the "apply operating system" step and make a manual step that will not check if my C: drive is a USB drive.

I was hoping there's a variable that can force SCCM to deploy OS to a USB stick or any other suitable solution

thanks

Tamir Levy