A few steps to make a bootable USB flash drive using the diskpart command. Requires an elevated command prompt.
1. Start diskpart
C:WINDOWSsystem32>diskpart
Microsoft DiskPart version 6.3.9600
Copyright (C) 1999-2013 Microsoft Corporation.
On computer: CTCRK8
DISKPART
2. Select USB flash drive
DISKPART> list disk Disk ### Status Size Free Dyn Gpt -------- ------------- ------- ------- --- --- Disk 0 Online 223 GB 0 B Disk 1 Online 298 GB 350 MB Disk 2 Online 29 GB 0 B DISKPART> select disk 2 Disk 2 is now the selected disk.
3. Clean (remove partitions and any format of active disk)
DISKPART> clean
DiskPart succeeded in cleaning the disk.
4. Partition
DISKPART> create partition primary
DiskPart succeeded in creating the specified partition.
5. Format
DISKPART> select partition 1 Partition 1 is now the selected partition. DISKPART> format fs=ntfs label=Bootable quick 100 percent completed DiskPart successfully formatted the volume.
6. Set Active bit
DISKPART> active
DiskPart marked the current partition as active.
7. Assign Drive Letter (Optional Step)
DISKPART> assign
DiskPart successfully assigned the drive letter or mount point.
