Is it reliable to estimate the used space of a filesystem by summing up the sizes of the subdirectories of...












0















I have an external hard drive with one partition and a NTFS filesystem. Under its top directory:



$ sudo du -d 0 -h * | sort -h

0   temp

7.5K    $RECYCLE.BIN

25K System Volume Information

690M    dir1

1.5G    dir2

3.2G    dir3

15G     dir4

71G     dir5

98G     dir6

522G    dir7


roughly the drive has 0.7+1.5+3.2+15+71+98+522 = 711.4 G in used.



But 



$ sudo df -h

Filesystem           Size  Used Avail Use% Mounted on

/dev/sdb1            932G  880G   53G  95% /media/t/My Passport


and gparted shows the hard drive has 931.48GiB in Size, 879.47GiB Used, and 52.01GiB Unused.



So why do the three ways give different results? Why does the first way give very different result from the the other two in particular?



Thanks.






hard-disk disk-usage






share





























    0















    I have an external hard drive with one partition and a NTFS filesystem. Under its top directory:



    $ sudo du -d 0 -h * | sort -h
    
0   temp
    
7.5K    $RECYCLE.BIN
    
25K System Volume Information
    
690M    dir1
    
1.5G    dir2
    
3.2G    dir3
    
15G     dir4
    
71G     dir5
    
98G     dir6
    
522G    dir7


    roughly the drive has 0.7+1.5+3.2+15+71+98+522 = 711.4 G in used.



    But 



    $ sudo df -h
    
Filesystem           Size  Used Avail Use% Mounted on
    
/dev/sdb1            932G  880G   53G  95% /media/t/My Passport


    and gparted shows the hard drive has 931.48GiB in Size, 879.47GiB Used, and 52.01GiB Unused.



    So why do the three ways give different results? Why does the first way give very different result from the the other two in particular?



    Thanks.






    hard-disk disk-usage






    share



























      0












      0








      0








      I have an external hard drive with one partition and a NTFS filesystem. Under its top directory:



      $ sudo du -d 0 -h * | sort -h
      
0   temp
      
7.5K    $RECYCLE.BIN
      
25K System Volume Information
      
690M    dir1
      
1.5G    dir2
      
3.2G    dir3
      
15G     dir4
      
71G     dir5
      
98G     dir6
      
522G    dir7


      roughly the drive has 0.7+1.5+3.2+15+71+98+522 = 711.4 G in used.



      But 



      $ sudo df -h
      
Filesystem           Size  Used Avail Use% Mounted on
      
/dev/sdb1            932G  880G   53G  95% /media/t/My Passport


      and gparted shows the hard drive has 931.48GiB in Size, 879.47GiB Used, and 52.01GiB Unused.



      So why do the three ways give different results? Why does the first way give very different result from the the other two in particular?



      Thanks.






      hard-disk disk-usage






      share
















      I have an external hard drive with one partition and a NTFS filesystem. Under its top directory:



      $ sudo du -d 0 -h * | sort -h
      
0   temp
      
7.5K    $RECYCLE.BIN
      
25K System Volume Information
      
690M    dir1
      
1.5G    dir2
      
3.2G    dir3
      
15G     dir4
      
71G     dir5
      
98G     dir6
      
522G    dir7


      roughly the drive has 0.7+1.5+3.2+15+71+98+522 = 711.4 G in used.



      But 



      $ sudo df -h
      
Filesystem           Size  Used Avail Use% Mounted on
      
/dev/sdb1            932G  880G   53G  95% /media/t/My Passport


      and gparted shows the hard drive has 931.48GiB in Size, 879.47GiB Used, and 52.01GiB Unused.



      So why do the three ways give different results? Why does the first way give very different result from the the other two in particular?



      Thanks.






      hard-disk disk-usage




      hard-disk disk-usage





      share














      share












      share



      share








      edited 16 secs ago







      Tim

















      asked 5 mins ago









      TimTim

      27.3k78264473




      27.3k78264473






















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