GDisk and WinPE

Hello,

I'm using SCCM 2012 R2 to deploy a TS that contain gdisk32.exe /DISK:ALL /diskwipe. This command fail with the error "cannot lock disk". The way I'm loading the ts is Boot to PXE and start the TS, so the system HDD isn't used. Why can't I lock the disk?

My goal is to create a TS that will wipe all physical disk and do various configuration before shipping the computer to recycling facilities.

Thank you!