#1 - On windows, open Command Prompt (cmd).
#2 - Type "diskpart", press Enter.
#3 - Type "list disk", press Enter - and it will tell you which drives are which, including USB flash drives. Since I only had a hard drive and one 16GB flash image, that gave me the idea as to which disk I will take into consideration. My hard disk was 0 and my USB drive was 1.
#4 - Type "select disk X" where "X" is the location of your troubled USB drive. Press Enter.
#5 - Type "clean" and then further down the line, you will see something weird a few lines down...
Microsoft Windows [Version 6.1.7601] Copyright (c) 2009 Microsoft Corporation. All rights reserved. C:\Users\Administrator>diskpart Microsoft DiskPart version 6.1.7601 Copyright (C) 1999-2008 Microsoft Corporation. On computer: 7 DISKPART> list disk Disk ### Status Size Free Dyn Gpt -------- ------------- ------- ------- --- --- Disk 0 Online 74 GB 0 B Disk 1 Online 14 GB 14 GB * DISKPART> select disk 1 Disk 1 is now the selected disk. DISKPART> clean DiskPart has encountered an error: Access is denied. See the System Event Log for more information. DISKPART>
And so, you get an "access denied" error and another window should pop up saying that the drive needs to be formatted.
#6 - Close both the CMD and the Format Disk windows, hold down "Windows Key + R" to bring up a short Run window, and enter "diskmgmt.msc". Press Enter to run this command and make sure you are logged into Windows as Administrator while using Enterprise, Business, or Ultimate packages. DO NOT UNDER ANY CIRCUMSTANCE USE HOME PREMIUM/BASIC!
#7 - In Disk Management, your flash drive should appear in a complete black bar and all "EFI System Partitions" should be wiped out after you just got through using DISKPART. Right-click anywhere within the black bar, click New Volume, and follow the instructions that gives you.
#8 - Lay back because it could take a while depending on how much storage your drive has.
Right now, I am still trying this and so far, this method has solved most of my formatting and flash drive usage problems. Will it do the same for your flash drives?! Good luck, everyone, and make sure you are observing the OSx86 revolution even if it kills you.