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

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.

edited 54 secs ago

asked 6 mins ago

Tim

27.3k78264473

add a comment |

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.

edited 54 secs ago

asked 6 mins ago

Tim

27.3k78264473

add a comment |

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.

edited 54 secs ago

asked 6 mins ago

Tim

27.3k78264473

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

edited 54 secs ago

asked 6 mins ago

Tim

27.3k78264473

edited 54 secs ago

asked 6 mins ago

Tim

27.3k78264473

edited 54 secs ago

asked 6 mins ago

Tim

27.3k78264473

asked 6 mins ago

Tim

27.3k78264473

asked 6 mins ago

Tim

27.3k78264473

add a comment |

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