USB HDD problem on boot

  dms_05 09:28 05 Oct 2014

I've a 2.5" HDD in a USB caddy. If I hot plug after booting my W8.1 system then all is well but if I leave the USB HDD connected and boot from cold then the USB HDD isn't shown. Unplugging and re-plugging the USB makes the HDD visible. Can I correct this to show the USB device from a cold boot?

  Fruit Bat /\0/\ 11:51 05 Oct 2014

a) Press Windows Key + R and type devmgmt.msc in the Run dialog box to open Device Manager.

b) When the Device Manager window opens, you need to find the USB device which is giving trouble. It may be listed under Human Interface Devices as USB Input Device.

If not there, expand Universal Serial Bus controllers. Find the one in the list for your drive, right click over this entry, pick Properties.

c) In the device properties window, change to Details tab. Click the menu for Properties and select Device Instance Path. Note down the corresponding Value it is a combination of three IDs - namely Vendor ID (VID), Product ID (PID) and Instance ID.

d) Press Windows Key + R combination, type regedit in Run dialog box and press Enter Registry Editor opens.

e) Navigate here:

HKEYLOCALMACHINE\SYSTEM\CurrentControlSet\Enum\USB\Device Parameters

Substitute the Device Instance Path part (after USB) with the number obtained from the step c.

f) In the right pane of Device Parameters key look for the DWORD named EnhancedPowerManagementEnabled which must be showing its Value data as 1. Double click on the same to get this:

g) In the above shown box, change the Value data to 0. Click OK. Close the Registry Editor and Device Manager.

h) Reboot the PC and retry.

  dms_05 15:56 05 Oct 2014

Thanks. I couldn't find any signs in DM but went through all the USB devices shown in regedit's HKEYLOCALMACHINE\SYSTEM etc. Here I found two instances of EnhancedPowerManagementEnabled which showed 1 in the DWORD. So I changed both to 0 and now my problem is solved!

  Fruit Bat /\0/\ 17:24 05 Oct 2014

Glad its sorted thanks for the feedback.

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