Two of my partitions disappeared. i can t access these partitions from nautilus

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http://askubuntu.com – However GParted detects them. The filesystems were ext4 and ntfs(old windows partition). They used to be mounted at /media/part1 for the ext4 and /media/ntfs. Last night after reading through the man pages for mount and fs, I put together this solution: create the missing directories in the /media dir and then type: sudo mount /dev/sda1 ext4..etc. Is this the way to fix the problem? (HowTos)