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Backup tape was overwritten + corrupt .bkf restore - What are my options? Utilities?

I was asked to restore an e-mail backup from a couple of years ago. The Exchange files are dumped to a .bkf file and then written to tape. I tried to restore this but it crapped out about 70% of the way through. Out of 150GB, there'a bout 115GB of that .bkf written.

Due to negligence, the tape was then overwritten by an overzealous DB backup when there weren't enough tapes to write to.

Questions are these:

Is there anything that you can do with a partially written .bkf file?
Is there anyway to recover data from a tape that has been overwritten?

We'd like to view the contents of the .bkf and check for any intact Exchange databases but I'm not sure it's possible. If anyone has any tools they can recommend, we're very interested.
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secretmachine
Asked:
secretmachine
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MesthaCommented:
You need to speak to a data recovery company. They might be able to recover something, whether there is enough to recover from is a different matter.

-M
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secretmachineAuthor Commented:
Do you know if there are any utilities. I know tape isn't a hard drive so the same rules don't apply but maybe some utilities exist.

If I'm screwed, I'm screwed... I just wanted to put out the request for anyone that's been in a similar situation.
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MesthaCommented:
Everytime you touch the tape, you damage the data. If you need that data get it to a data recovery company.

-M
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TapeDudeCommented:
With an LTO 2 tape, you will almost certainly not be able to get any of the old data off from any of the over-written section. A data recovery bureau MAY be able to retrieve the data AFTER the overwritten section, but if the original data was the same length or shorter than the overwrite, you're almost certainly screwed.

However, the data recovery bureau should be able to retrieve whatever's in the first 115GB chunk of the BKF file, assuming you've held onto it.

Whereabouts are you?
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secretmachineAuthor Commented:
I am in Phoenix, Arizona and not far from Tempe, Arizona.

Thanks for the information. I did hold on to the 115GB chunk just to keep all potential options available.
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TapeDudeCommented:
Hmm, I'm in Britain so I can't help you. Ontrack probably can (www.ontrack.com), but be prepared to pay through the nose for it : (

Time to get googling for some competitive quotes, I think...
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