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Select Start -> click Run.
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Type regedit and click OK to open the registry editor.
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Go to the key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\StorageDevicePolicies.
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If the StorageDevicePolicies does not exist, create it manually by right-clicking on the control key and selecting New -> Key.
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In the right window, double-click on WriteProtect, and set the value to 0. If WriteProtect does not exist, then right-click the new StorageDevicePolicies key and select New –> Dword, specify the name as WriteProtect, double-click WriteProtect, and set the value to 0.
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If it is an external hard disk, disconnect the hard disk and reconnect it. If it is an internal hard disk, restart the machine.