Hi, thank you for the answer. Because my bad english speack you don't understand my first post. I , i have not enouth free disk space on my computer to backup all DNS323's data
Finally, I do this:
1/ I remove the DNS323's left disk
2/ I plug this disk in my PC and format it in NTFS
3/ Copy data from DNS323 to My computer
4/ Format DNS323's right disk in single volume
5/ Copy data from my computer to DND323
6/ And plug the left disk and format in second single volume