I changed my external hard disk to ntfs from fat32 and it did well but i can't open the files in the briefcase a mesage comes (the briefcase cannot be opened because the disk is inaccessible)
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Was the briefcase located on the external? To change from fat32 to NTSF you need to reformat, which would have erased all data from the external. Set up a new briefcase and see if you have the same issue.