By default, the ext3 and ext4 filesystems reserve 5% space for use by the root user. This reserved space counts as Non DFS Used . The Reserved block count is the number of ext3 / ext4 filesystem blocks that are reserved.
The default percentage of reserved space for the root user on new ext4 filesystems is typically 5%. This reserved space is used to ensure that the root user (superuser) can still write to the filesystem even if it becomes full to prevent system instability.
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