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I'm trying to erase a write-protected USB flash drive. This drive was distributed with Autodesk software on it; the write protection was intentional. I've tried formatting and deleting, which of course doesn't work; I've tried to set the registry at HKEYLOCALMACHINE/SYSTEM/CurrentControlSet/StorageDevicePolices/WriteProtect to 0 using regedit, which hasn't changed a thing; somebody recommended I change the drive letter, which it won't let me do.
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There is a very long set of instructions in - too long to re-post here (sorry, flaggers) - which specifically focuses on breaking the write protection on Autodesk-distributed media to repurpose the devices. Note that it requires a USB 3.0 port, and installation and usage of some low level vendor-specific utilities to disable write protection on the device. The write protection is vendor-specific and implemented at the controller level. You will not find a physical switch and there is nothing you can do at the file-system / data level to change it.