Windows 10: USB stick in use.

Have a problem I can't fix for a while now. Whenever I try to format it, make boot disk etc. I get a message that it's in use (by something) no idea what. It can be empty, not formatted, formatted etc. but same thing happens. Otherwise they work fine, I can write to them, delete or do whatever else except format.
In safe mode works fine.

:)

 

Installing windows off of a USB stick

Step By Step from vista:
From admin cmd prompt

1. diskpart
1a. list disk
2. select disk 1 (replace 1 with your usb drive)
3. clean
4. create partition primary
5. select partition 1 (replace 1 with your usb drive)
6. active
7. format fs=fat32
8. assign
9. exit

Copy Windows Vista's DVD ROM content to the Flash Drive

xcopy d:\*.* /s/e/f e:\ (d being your vista cd and e being your usb stick)

And that's it, boot off your usb disk

 

Cannot get Win10 to recognize a 128g usb memory stick.

Hello Brad,

To assist you with your concern, please answer the following:

• Which device are you using?
• Are you receiving any error message when you're trying to connect your USB Memory Stick?
• Have you tried any troubleshooting steps?

Looking forward to your response.

 

USB boot for bios update

Did the first step. It already doesn't work. Note the capacities and drive letters M:/N: The HP utility is about to format my raid-1 volume containing my 2 750gb drives. It thinks it's the usb stick. I can not select any other drives in the HP utility. My 512mb usb stick is U:.

Any other suggestions?