There are several '''3rd party applications that may recover some or all of the data.''' I have used: [http://www.prosofteng.com/specials/|DataRescue 3]. The great thing about it is that you can try it for free to see what data is able to be "rescued". If, after having seen what can actually be rescued, you actually want to save the data, then you can pay for the password that will enable the actual recovery function. I prefer it over TechToolPro 6. Some of these [http://data-recovery-software-review.toptenreviews.com/mac-recovery-software/|I haven't tried].
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