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Thank you John,

Finally I succed to format the USB Key. It takes a long time by the way. Probably it's normal.
:D
best regards
L

I used Paragon EXTFS for Imac with 10.6.8 and it worked perfectly.
I changed my mac and I'm using 10.11 El Capitan.
I imported the new version of Paragon EXTFS.
I need to format USB Key to EXT3....