Windows PE: UFD not listed in diskpart

Question

I've used the instructions provided by Microsoft's Building a Standard Image of Windows 7: Step-by-Step Guide.
I can successfully boot from UFD to Windows PE.
Once booted into Windows PE, when running diskpart command and then
list disk my UFD does not show up. The only thing I see is the local hard disk.
I have tried this with multiple UFDs and booted onto multiple machines (desktops and laptops) from multiple manufacturers and in multiple USB ports. Another thing to note is that if I open notepad, and then browse to open a document, the UFD shows up but
only with 300MB regardless of actual size.
Any help is greatly appreciated.

Answer 1

Hi
First, avoid USB 3.0 ports if the firmware doesn't contain native support for USB 3.0. Disable USB 3.0 from BIOS if supporting and try boot windows PE.
And some users reported that WinPE boots fine but the USB stick it booted from does not show up as a drive unless remove the stick and reinsert it, or assign a drive letter to it. You might give it a try.
If the issue still persists, we think the button is driver loading.
You might need to inject drivers into windows PE.
About how to add Device Drivers on an Offline Windows PE Image
https://technet.microsoft.com/en-us/library/dd799289(v=ws.10).aspx
Also we recommend you try rebuilding a Windows PE 5.1 by using Windows Assessment and Deployment Kit (Windows ADK) and give it a try.
https://technet.microsoft.com/en-us/library/hh825109.aspx
Regards