[xubuntu] what is " [jbd2/sda1-8] " writing to my HD?

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http://ubuntuforums.org – hi, when I run Code: sudo iotop -a I always see something like this being wrote to my HD Code: TID  PRIO  USER  DISK READ  DISK WRITE  SWAPIN  IO>    COMMAND 312  be/3  root  0.00 B    548.00 K    0.00%  0.67%  [jbd2/sda1-8] with the Disk Write quantity constantly being increased. Does anybody know what the command " [jbd2/sda1-8] " is? (Hardware)