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.









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.









    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.









      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





      share














      share












      share



      share








      edited 16 secs ago







      Tim

















      asked 5 mins ago









      TimTim

      27.3k78264473




      27.3k78264473






















          0






          active

          oldest

          votes











          Your Answer








          StackExchange.ready(function() {
          var channelOptions = {
          tags: "".split(" "),
          id: "106"
          };
          initTagRenderer("".split(" "), "".split(" "), channelOptions);

          StackExchange.using("externalEditor", function() {
          // Have to fire editor after snippets, if snippets enabled
          if (StackExchange.settings.snippets.snippetsEnabled) {
          StackExchange.using("snippets", function() {
          createEditor();
          });
          }
          else {
          createEditor();
          }
          });

          function createEditor() {
          StackExchange.prepareEditor({
          heartbeatType: 'answer',
          autoActivateHeartbeat: false,
          convertImagesToLinks: false,
          noModals: true,
          showLowRepImageUploadWarning: true,
          reputationToPostImages: null,
          bindNavPrevention: true,
          postfix: "",
          imageUploader: {
          brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
          contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
          allowUrls: true
          },
          onDemand: true,
          discardSelector: ".discard-answer"
          ,immediatelyShowMarkdownHelp:true
          });


          }
          });














          draft saved

          draft discarded


















          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f503043%2fis-it-reliable-to-estimate-the-used-space-of-a-filesystem-by-summing-up-the-size%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown

























          0






          active

          oldest

          votes








          0






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes
















          draft saved

          draft discarded




















































          Thanks for contributing an answer to Unix & Linux Stack Exchange!


          • Please be sure to answer the question. Provide details and share your research!

          But avoid



          • Asking for help, clarification, or responding to other answers.

          • Making statements based on opinion; back them up with references or personal experience.


          To learn more, see our tips on writing great answers.




          draft saved


          draft discarded














          StackExchange.ready(
          function () {
          StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f503043%2fis-it-reliable-to-estimate-the-used-space-of-a-filesystem-by-summing-up-the-size%23new-answer', 'question_page');
          }
          );

          Post as a guest















          Required, but never shown





















































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown

































          Required, but never shown














          Required, but never shown












          Required, but never shown







          Required, but never shown







          Popular posts from this blog

          サソリ

          広島県道265号伴広島線

          Accessing regular linux commands in Huawei's Dopra Linux