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How can I see or control why Windows Indexing is filling up this drive?

See this report from Tree Size (as Administrator): Drive is full with hidden files

Only about 200 GB is reported, but Windws says 254 GB used.

Now when I rebuild the Windows Index database:

Windows Index rebuilding

135 GB is freed up!

Where did all that space came from?

I have changed settings for indexing so it only index users Outlook, but this still happen every 2 weeks or so.

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    So you are indexing over 100GB of OST / PST? – BlueCompute Jun 11 '15 at 9:56
  • Yes, I am, why? – kimr-dk Jun 11 '15 at 13:27
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    The content density is massive. How much storage do you think it should take to store a comprehensive index of messages, contents, text, senders, recipients etc? – BlueCompute Jun 11 '15 at 13:57
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    Also, you're almost certainly doing it wrong. I can't think of a single good reason to be indexing a massive set of OST / PSTs. Have you heard of 'mail archiving'? – BlueCompute Jun 11 '15 at 13:58
  • Much less that the actually e-mails? As attachments and images won't need to be saved. There are 14 ost-files, 3 biggest are about 20 GB, as Office 365 max is 50 GB I can't see why that is too much. I do indexing of Outlook so searching for e-mails don't take forever. – kimr-dk Jun 11 '15 at 17:32
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I have not had this issue in a long time now, so I think it's time to close.

I also created a thread on MS Partner forum, but it didn't bring anything new.

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