usb_hdd_knoppix7.2 becomes Read_Only

[knp]

Good evening

My usb_hdd_knoppix7.2 becomes Read_Only after an error from Libre Office.

It seems to be a problem of "fstab, mtab or similar" and "input-output file-system" from certain messages.

I cannot access others partitions after booting and working with this usb_Hdd I can access and work "normally" when working by "bootfrom_iso" with another knp7.2 disk excepted "DELETING" the libre-office file responsable of the problem.

DELETING IS a real problem (exemple:
I cannot wipe the content of the "recyled_folder"

HOW to make writable my Knoppix_Usb_HDD?

Thanks you all

knp