Git, Windows, Linux & NTFS: "index file open failed"

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http://stackoverflow.com – I created a git repo in Windows 7 on a NTFS partition and when opening it in Linux (Ubuntu 12 x64, dual-boot setup) I get the index file open failed error. How can I figure out what's wrong? The partition is mounted read-write and I've never had any other problems. Does git store data in a different format Windows vs. Linux and I need to do either a clone or some conversion? I'd really like to be able to work on the same repo in both OSs without cloning around... Clarification: I also get cat: index: Input/output error when running the command cat index in the .git dir, so it is a NTFS relat (HowTos)