SCCM Custom Variable question

[Jepeto 46]

I am trying to create a variable which will capture user data to a USB drive. I run the following command line to get the USB drive

cmd /c powershell.exe -executionpolicy bypass -command "& {$tsenv = New-Object -COMObject Microsoft.SMS.TSEnvironment; $tsenv.Value('USBDrive') = (Get-WMIObject Win32_Volume | ? { $_.Label -eq 'USMT' }).Name}"
Dumping the variables, it seems right

OSDEnableTCPIPFiltering = false
OSDStateStorePath = USBDrive
SMSTSDisableWow64Redirection = false
SMSTSLocationMPs = http://ConfigMGR.lab.local
SMSTSRebootMessage = 
SMSTSRebootReason = 
SMSTSRebootRequested = 
SMSTSRetryRequested = 
SMSTSUser = 
USBDrive = E:\

In the end of the variable dump I see this:

SMSTSUserStatePath = C:\_SMSTaskSequence\UserState

however when I try to redirect the capture to the %USBDrive% it's not working. Everything works perfect if I hard code it with E: (which I really prefer not to do).

The TS order is below

 

[Jepeto 46]

I had to change mindset and finally got a standalone media which can capture USMT as well. I had to dump the variables in order to find out I was not in the right path. I ended up creating a new variable (it's all one line)

cmd /c powershell.exe -executionpolicy bypass -command "& {$tsenv = New-Object -COMObject Microsoft.SMS.TSEnvironment; $tsenv.Value('USBDrive') = (Get-WMIObject Win32_Volume | ? { $_.Label -eq 'CMBOOT' }).Name.substring(0,2)}"

After hours of testing I realized that substring(0,2)} is the most important part, it will not capture to E:\ but will to E:

Now I could set the OSDStateStorePath variable to %USBDrive% and everything started working.

Here is the basic TS