If a Forensic System, First Aid Kit or bootable Linux system has been loaded onto a USB stick, the USB stick cannot be used by Windows at full capacity. As you have probably noticed when you insert a USB stick of this kind, the Windows operating system reports a different number of drives, some of which cannot be read. In order to load a new Forensic System/First Aid Kit onto a stick of this kind or to be able to use it in full under Windows, the existing structure of the USB stick needs to be deleted and the USB stick repartitioned and formatted.
Windows provides a data media management system for this. Although this displays all the partitions on the USB stick, it is unfortunately not able to delete some of them. The command line tool diskpart can help.
To start the tool, press Windows button+R In the dialog that pops up, enter diskpart and press OK. Confirm the warning message by pressing Yes. In the next step, you can get an overview of the drives. To do this, enter list disk. All the drives (hard drives and USB sticks connected) that the system recognizes are displayed. Switch to the relevant drive by entering select disk 1 (number 1 is, for example, the USB stick you wish to edit). Enter clean to delete the existing structure on the drive. An Explorer window will probably appear with a message about formatting the data medium. Close both.
Now set up a new partition on the USB stick using the command create partition primary. Then switch to this partition by entering select partition 1. In order for the stick to be able to be used again, it then needs to be formatted. If it is larger than 8 GB, select ntfs as the file system and fat32 for smaller USB sticks. Enter the command format fs=ntfs.
After formatting, an Explorer window should open up for the USB stick. If this does not happen, please enter assign to assign a drive letter to the USB stick.
Once the Explorer window has opened, enter exit in Diskpart and the Diskpart window will close. You can then work with the USB stick as normal.