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Upgrading ESXi 4.1 to 5.1 - Permission denied error

I am unable to upgrade an ESXi 4.1 installation to 5.1.  I boot from the 5.1 setup CD, and the setup program sees my existing installation and datastores.  I select the option to upgrade and preserve datastores.  Immediately after the upgrade begins, I get the error (snipped):
"Operation failed.  vmkfstools failed with the message: create fs deviceName....Creating vfat file system on.....Permission denied. (Have you set the partition type to 0xfb?)."
Full error message in attached screenshot. Thanks for any help.
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Assume you have your datastore on local storage? VMware has a KB on this error & a resolution:

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akitsupport - did not see anything applicable in that article.

coolsport00 - correct, local storage.  My error message is a little different, but I looked at the partitions anyway, and they do not have the issue in the KB.  My 2nd partition is a 4GB "W95 FAT16 (LBA)" partition, and the datastore is on the 3rd partition.  I had installed ESXi 4.1 on a new unpartitioned HD, so all the partitions are the default ESXi setup, nothing out of the ordinary.

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Was really hoping to just upgrade in place, but I ended up installing fresh after no real solution found.