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To change the ownership of a fat32 (vfat) partition, use the "uid=" and "gid=" mount options. You can use either a name or the corresponding UID number. You can't use chown or chgrp for a vfat partition. Also, the permissions of all files will be the same. The permissions of all of the directories will be the same as well.
I recently added an entry to my /etc/fstab file to mount a pen drive this way:
The "user" option lets me mount the drive as a normal user. The "noauto" prevents it from being mounted when booting. You want to use this for external drives. Use the "auto" option instead for an internal drive. The umask and dmask options effect the rwx permissions. See the man page for the mount command for more information.
You can't use chown or chgrp for a vfat partition.
And the reason for this is simple:
VFAT is a filesystem that simply can't store user credentials on file/directory level.
Hence, your chown will fail, as the filesystem can't modify a value that isn't stored.
Your only way of modifying access to VFAT drives is through the mount options (ie in /etc/fstab), which basically apply
to the entire mounted filesystem, so to all files.
Support in Linux for writing to NTFS partitions has been doubtful for quite some time. So you should check
out relevant web sites on NTFS support in Linux for clues. I'm guessing you'll need a kernel module or something like that.