Exclamation External SD-Card locked in writing :(

Hello,

I just realize it because the backup Titanium Backup was impossible.
When I went to see the backup preferences, where it was resolved that the backup was done on the external SD, he told me that the path is impossible because the SD card is locked??

Since I have to experiment with Sold Explorer to copy the file on the SD external, and it is impossible. As file deletion.

Here's what I tried:
- Wipe Cache + Wipe Dalvik Cache
- Remove/Up SD
- Change the permissions with Root explorer -> but the change is denied.

I said that my ZL is with the latest Official 4.3 (I know that there are some SD problem with Kitkat)
It is a micro-SD 64GB Sandisk that worked correctly for 1 year

Thank you for your help
Excuses my english....I'm french
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SONY Xperia ZL C6503
JB 4.3 - 10.4.1.B.0.101
Rooted
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HTC Sensation
CyanogenMod 10.1 Jellybean 4.2.2 - KANG by albinoman887