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OK merci la bonne syntaxe était
sharenetwork_smb1=ROMS@192.168.0.208:Roms:username=RecalRoms,password=xxx
Alors que quand j'accéde à mon NAS en SSH, le chemin c'est volume1/Roms et non Roms tout court. D'où l'erreur.
Merci @OyyoDams