http://blogs.technet.com/b/brad_rutkowski/archive/2007/08/15/discrepancy-in-volume-size-when-you-extend-a-volume-with-diskpart.aspxHad an issue come in today where the customer requested that one of their drives on SAN storage be expanded. They carved out the necessary disk space and expanded the LUN which was verified showing 430GB total on the array. Rescanned in Disk Managementen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.technet.com/b/brad_rutkowski/archive/2007/08/15/discrepancy-in-volume-size-when-you-extend-a-volume-with-diskpart.aspx#3482728Thu, 23 Feb 2012 09:32:18 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3482728Jason<p>I am looking at the same error as Christopher Beard (&quot;DiskPart failed to extend the file system on the volume&quot;). I have not yet come across any documentation regarding this error, but I suspect it is a corruption issue based on errors in eventvwr since extending the partition. Once a chkdsk completes, I will try extending the file system again.</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3482728" width="1" height="1">http://blogs.technet.com/b/brad_rutkowski/archive/2007/08/15/discrepancy-in-volume-size-when-you-extend-a-volume-with-diskpart.aspx#3388362Fri, 18 Feb 2011 14:47:39 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3388362Christopher Beard<p>I have a question. I got the error that the partition had been successfully extended but not the file system. I ran EXTEND FILESYSTEM and received a message: &quot;Diskpart failed to extend the filesystem on the volume.&quot; Any idea how to resolve this issue? The drive I extended was 1TB and I extended it to 1976.56 GB so I didn&#39;t break the 2TB limit of a basic drive. What can I do?</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3388362" width="1" height="1">