Luca Carlon:

I would like to repartition a USB drive using Diskpart from a C# application. This seems reasonably simple: I collect data about plugged disks using the Win32_DiskDrive class and then use DiskPart to run a script that will change the partitions. Critical point seems to be that of mapping the entry I select from Win32_DiskDrive to a Disk number in DiskPart. For instance, this is the output of DiskPart:

DISKPART> list disk

  Disk ###  Status         Size     Free     Dyn  Gpt
  --------  -------------  -------  -------  ---  ---
* Disk 0    Online          100 GB      0 B
  Disk 1    Online           14 GB      0 B

I need to select the disk by its number. But where do I get that number from data retrieved using Win32_DiskDrive? I guess the answer is using the "DeviceID" field, which returns this "\\.\PHYSICALDRIVE0". The index at the end seems to be the one I need to match the entry from Win32_DiskDrive with the related entry from DiskPart. Is this correct? Critical question is: is there any place in the official docs where this is stated without doubts? I will then format the device so I cannot do anything wrong here. Thanks.