Windows explorer does not display free space correctly if more than few hundred TB

Richard Sharpe realrichardsharpe at
Tue May 13 04:37:37 MDT 2014

On Tue, May 13, 2014 at 2:54 AM, Richard Sharpe
<realrichardsharpe at> wrote:
> Hi folks,
> We are seeing some interesting behavior when there is lots of free space.
> Windows explorer does not display the free space when there is more
> than a few hundred TB (although we do not exactly when this starts, we
> know it hits with 900TB.)
> It does not seem to occur with the command prompt. It seems to happen
> with Windows 7, Server 2008 and Windows 8 and Server 2012.
> Has anyone seen this.

This shows the output from the dir command:

 Volume in drive Z is dept
 Volume Serial Number is 7DA6-7404

 Directory of Z:\

06/15/2013  02:24 AM    <DIR>          .
06/27/2013  01:48 AM    <DIR>          ..
01/17/2014  11:01 PM    <DIR>          SW
03/18/2014  09:42 PM    <DIR>          QA
               0 File(s)              0 bytes
               4 Dir(s)  1,009,809,938,155,520 bytes free

Note all those free bytes. Perhaps the problem is with more than 1PiB
of free space.

Richard Sharpe

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