SummaryLinux seems to be unmounting the root partition, /dev/sda6. I noticed that sda6is about 80% full. Does Linux unmount this root partition when it gets 80% full,to stop you adding more files?The unmounted /dev/sda6 seems to be preventing me from accessing /media/sda7,where I have many video files. The output below shows /dev/sda7 /media/sda7 asunmounted. However, SOMETIMES mount does show it to be mounted (but /dev/sda6as unmounted).Could you suggest a fix please?My system is Knoppix on hard disc (effectively Debian).Full DetailsFollowing shows /etc/fstab and mount command output. $ cat /etc/fstab  \# DEFAULT BASE FSTAB, UNCONFIGURED  proc       /proc         proc       noauto             0 0  sysfs      /sys          sysfs      noauto             0 0  /dev/sda6 / reiserfs relatime 0 0  /dev/sda5 none swap defaults 0 0  \# Added by KNOPPIX     noauto,users,exec 0 0  \# Added by KNOPPIX  /dev/sda7 /media/sda7 reiserfs noauto,users,exec 0 0  \# Added by KNOPPIX  /dev/sr0 /media/sr0 auto noauto,users,exec 0 0  \# Added by KNOPPIX  /dev/sda3 /media/sda3 ntfs noauto,users,exec,umask=000,uid=knoppix,gid=knoppix 00  \# Added by KNOPPIX  /dev/sda2 /media/sda2 ntfs noauto,users,exec,umask=000,uid=knoppix,gid=knoppix 00  \# Added by KNOPPIX  /dev/sda1 /media/sda1 ntfs noauto,users,exec,umask=000,uid=knoppix,gid=knoppix 00  $ mount  /dev/root on / type reiserfs (rw,relatime)  proc on /proc type proc (rw,relatime)  sysfs on /sys type sysfs (rw,relatime)  usbfs on /proc/bus/usb type usbfs (rw,relatime)  tmpfs on /tmp type tmpfs (rw,relatime,size=2097152k)  udev on /dev type tmpfs (rw,relatime,size=20480k)  tmpfs on /dev/shm type tmpfs (rw,relatime,size=2097152k)  devpts on /dev/pts type devpts (rw,relatime,mode=1777)  ramfs on /mnt/JG-ramdisc type ramfs (rw,relatime)  
Does Linux unmount the root partition when the partition is about 80% full?
partition;root;knoppix