couldn't mount because of unsupported optional features (4000400)

• To: For users of Fedora Core releases <fedora-list@xxxxxxxxxx>
• Subject: couldn't mount because of unsupported optional features (4000400)
• From: Sjoerd Mullender <sjoerd@xxxxxxx>
• Date: Fri, 20 Apr 2007 19:27:39 +0200
• Openpgp: id=23BC8429
• Reply-to: For users of Fedora <fedora-list@xxxxxxxxxx>
• User-agent: Thunderbird 1.5.0.10 (X11/20070302)

Does anybody know what this means:
EXT3-fs: hdc1: couldn't mount because of unsupported optional features
(4000400).

I googled but only found questions.

I can read the disk (both fdisk and dd are happy enough), but I don't
want to overwrite anything if I don't have to.

# uname -r
2.6.20-1.2944.fc6

-- 
Sjoerd Mullender

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