“Drive mapping refers to local drive” error

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I am having a nasty problem and i can’t figure out what’s causing it.

We use DEM to create drivemappings. One of the drivermappings isn’t being created and shows an error in the flexengine.log

[ERROR] Drive mapping refers to local drive ‘H’ (Homedir.xml)

To me it looks like driveletter H is occupied at the moment DEM is trying to create the drivemapping.

When i do a -UemRefreshDrives after login, the mapping is created.


I have looked in the golden image and there is no H: drive in use, only C: and sometimes D: (cdrom)


After some help from DEMdev

You could try to investigate with a Before profile archive import Logon Task, running something like cmd.exe /c DIR H: >”%USERPROFILE%H-DIR.txt”.

I have found the culprit. The H drive is indeed in use:

Volume in drive H is CVApps

Volume Serial Number is AEE0-8B16



Directory of H:



04-09-2019  00:48                 0 allvolattached.bat

04-09-2019  00:48             1.355 allvolattached_shellstarted.bat

04-09-2019  00:48               320 cache.dat.initial

20-01-2020  14:19             1.472 cv_prestartup.log

20-01-2020  14:20               408 cv_prov_post.log

20-01-2020  14:20             6.225 META.ZIP

20-01-2020  14:20    <DIR>          METADATA

20-01-2020  14:19    <DIR>          OfficeTokensBefore

04-09-2019  00:48               261 prestartup.bat

04-09-2019  00:48             7.043 prov_post.bat

04-09-2019  00:48               372 shellstart.bat

20-01-2020  14:22            24.349 snapvol.cfg

04-09-2019  00:48                 0 startup.bat

04-09-2019  00:48               384 startup_postsvc.bat

28-08-2019  02:12           102.640 svoffice.exe

28-08-2019  02:09               228 svoffice.exe.config

04-09-2019  00:48            16.452 tokens.dat.initial

04-09-2019  00:49                20 version.txt

28-08-2019  02:12                87 VERSION32.txt

28-08-2019  02:17                87 VERSION64.txt

              18 File(s)        161.703 bytes

               2 Dir(s)  21.300.944.896 bytes free

To me it looks like an appstack or writable is attached before login and is using drive letter H: and a bit further in the process the driveletter is released as it is not visible afer login.

We do use Writable Volumes and Appstacks so that makes sense, but i never had any issues with driveletters before.

Do you have any idea what could be te cause of this?


These are the registry settings on HKLMSYSTEMCurrentControlSetServicessvserviceParameters

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