What do you mean with 'blocked'?
And a note:
USB-sticks, like external hard disks (and floppy disks 20 years ago) aren't the right medium to STORE files, at least not the only copy. They are nice as a backup medium (but not the only one, preferably) and they are excellent to transport data between computers that aren't in a network.
If you use these media what they are meant for you can throw them away if they fail without losing anything. Makes sense, doesn't it. But some people don't and they pay a lot of money for professional data recovery services. Let's hope you don't need those.
Kees

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