ReadyBoost

Je vous salue,
ma flanche disque est protégé (Write Protection), j'ai essaie avec beaucoup des chemins mais le problème n'est pas résolu. J'ai vérifié properties est j'ai trouvé le message qui dit que: THIS DEVISE CANNOT BE USED FOR READYBOOST. The device is mounted read-only. This usually happens with write-protected devices/media or when BitLocker group policy settings prohibit write access to non-encrypted removable devices.
Qu'est-ce je peut faire???

Hello everybody,
my f. disc is WriteProtected, I tried with many softs to resolve this problem but it doesn't resolved.
If I check in properties I found this message:
THIS DEVISE CANNOT BE USED FOR READYBOOST. The device is mounted read-only. This usually happens with write-protected devices/media or when BitLocker group policy settings prohibit write access to non-encrypted removable devices.

Now can I do???