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VMware: Warning: /vmfs/devices/char/wmkdriver/usbpasstrough not found

After installing VMware ESX 4.1 with a connected USB (for USB passtrough in one of my VM’s) disk in my VMware Workstation 7.1 I received this error:

0:00:00:56.791 cpu0:4096)Warning: /vmfs/devices/char/vmkdriver/usbpassthrough not found




– Edith the Virtual Machine hardware

– Add new hardware: USB Controller


– ^ Select: Show all USB input devices;


– ^ The USB Storage device is detected;


– ^ Connect the hardware en present it to the virtual machine

– Reboot the ESX 4.1 host



The error disappears and I can use my USB storage disk now for USB pass trough


Sander Daems is founder and author of this blog and working as a Lead (Sr.) Consultant by UNICA ICT Solutions. Sander has over 15 years experience in IT, primary focus: virtualization and modern worksplace.

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  1. Lennard
    July 22nd, 2010  (Quote) at 18:25  (Quote) | #1

    Het blijft toch instabiel spul he? Dat VMware 😉

  2. Ankur
    July 27th, 2010  (Quote) at 00:05  (Quote) | #2

    How do you do remediate this warning when the esx host is not a VM in Vmware Workstation – but a physical host?

  3. Datto
    April 14th, 2012  (Quote) at 12:47  (Quote) | #3

    For nested ESX 4.1 hosts running under ESX 5.0 — I added the USB controller to the nested ESX 4.1 host and then chose the USB 2.0/1.1 type controller (not the USB 3.0 controller which won’t work) and then clicked OK andrebooted the nested ESX 4.1 host. The problem and error message went away.


  1. at | #1