1

If I store a file in ext2, ext3, or ext4 formatted partition, it's permission is saved. I mean, I can have different permissions for different files in extX partition. However, If I store a file in NTFS partition, I can't change it's permission. The permission is depends on how NTFS partition is mounted. For example, with nautilus, all file permissions will be rwxrwxrwx.

It can bring some problems if I backed up some files that need different permissions from extX to NTFS. Two files with rw------- and rw-r--r-- permissions will have rwxrwxrwx permissions if stored in NTFS.

My points here is (which basically one point in the title):

  1. Where is the information about file permission stored?
    • If it stored in OS configuration, how can I get exactly the same permission if I reinstall the OS.
    • If it stored in the file it self, does it means file state is changed when copying from extX to NTFS and vice versa?
  2. If I have a lot of files with different permissions, then copy all of them to NTFS. Is it possible to get back the exact permissions for all file if I copy all of them back to extX?
  3. Is it possible to have different file permissions in NTFS?
2

The permissions are stored in file system metadata. NTFS and ext3/4 file systems differ substantially in how they store metadata. One solution would be to create a tar file of the source directory (with or without compression), writing the resulting file to the NTFS file system. When the content of the tar archive is extracted to a ext3/4 file system the permissions and ownership are preserved.

For example:

tar cvf /mnt/ntfs_share/archive.tar /source_ext4/*

Or, with bzip2 compression:

tar cjvf /mnt/ntfs_share/archive.tar.bz2 /source_ext4/*

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.