SD Card Reverts to Read Only

[Xplorer4x4]

I got a Transcend Class 6 - 16 GB sd card for x-mas. It works fine technically, however, after evry reboot the sd card reverts to read only. I have to go in to root explorer,browse to /mnt/sdcard or/ sdcard and change it to r/w and then evrything works fine again. Is it possible to permenantly fix this via a command in adb?

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