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how will modifying something on the linux partition give me certain privalages to what is on the fat 32 FS
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As you know, a partition needs to be 'mounted' to gain access to its data. This mounting is either performed manually with the 'mount' command, or done by the system, using the information in /etc/fstab. This is why a parameter in /etc/fstab can influence the partition that is mounted.
The problem with FAT32 is that it does not 'know' specific user permissions. Everyone who has access to the computer has access to the files. Linux filesystems however, use a permissions system that distinguishes between the owner, group and the rest of the world's users. The umask paramter in /etc/fstab tells Linux how to interpret the data on the FAT32 partition. It sets a mask for the whole partition. Unfortunately this does not allow the modification of single files and folders. You can only change the permissions of the entire partition.