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I have two additional disks /dev/sdb1 and /dev/sdc1 which are mounted on "/home/user/xxx1" and "/home/user/xxx2". But I am surprisingly find that although the files use the space on their disk, they also use the space on my os disk /dev/sda1. So it seems they are using double space.

du -h give the following information:

/dev/sda1        16G   13G  2.6G  83% /
/dev/sdc1        20G  3.7G   15G  20% /home/user/xxx2
/dev/sdb1        20G  5.0G   14G  27% /home/user/xxx1

but without xxx1 and xxx2, there are only a little files on the os disk.

It's really strange, is there anybody have any idea about this question?

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    What's the output of sudo du -hxd1 /?
    – muru
    Jul 24 '17 at 7:12
  • @muru I'm sorry, I made a mistake. I just checked ~/ but not /. Thank you for notice.
    – Sraw
    Jul 24 '17 at 7:15
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Try using:

df -h

It will list file systems, not partitions, so you can see an exact usage of each HDD.

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