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I'm trying to set permissions for folders on USB drives that I've mounted with Nautilus, but when I change the permission, it just changes right back again. No error message or any other explanation. I've tried "Open as administrator" and it still doesn't work. How do I set the permissions so that they can be accessed as shared folders on the network?

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The problem is that your USB stick is probably using FAT(16/32) or NTFS as file system which doesn't support permissions. That's why they change back after edit in nautilus. If you want to use permissions with USB sticks/drives, you'll need to format it to any EXT formats (use either 3 or 4) using gparted (install with synaptic).

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should add that using EXT file systems can not be read from windows without additional software (like fs-driver.org ) –  digitaljail Jan 15 '11 at 20:41
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That's what samba is made for: mounting and sharing FAT32 or NTFS drives. –  Takkat Jan 15 '11 at 23:38
    
@digitaljail: I can access shares of EXT folders from Windows. It doesn't need any additional software. –  endolith Jan 16 '11 at 0:59
    
@endolith as Share trough Samba, you right, but if you connect the USB drive to a Windows system for some reason, you need additional software in order to access data on the usb drive. –  digitaljail Jan 16 '11 at 14:18
    
and NTFS supports permissions –  endolith Mar 3 '11 at 6:08
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