Issue
On Citrix XenDesktop 5.6, you receive the following error when logging on to a desktop:
Citrix Personal vDisk failed to start.
Status code: 7
Error code: 0xb7
Cause
Most likely the drive selected in Desktop Studio wizard user interface (or Provisioning Services XenDesktop wizard user interface) was “V”.
Personal vDisk utilizes now two drive letters which default to P and V. The Desktop Studio Wizard (or Provisioning Services XenDesktop wizard user interface) does not present the option for the second drive which by default is V.
Resolution
In order to avoid this issue simply avoid selecting V as the drive letter in the Wizard interface.
If you still need to use V as the drive letter, then you can change the following registry key to some other drive letter so that it will not conflict with the drive letter in the XenDesktop Setup wizard.
Key : HKEY_LOCAL_MACHINE\Software\Citrix\personal vDisk\Config
Value : VHDMountPoint [REG_SZ]
Set this to the drive letter of your choice. Ensure that “:\” is appended to the end of your entry (Example: X:\ )
For further information, refer to article http://support.citrix.com/article/CTX131432