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data recovery.
i have a harddrive that currently has freebsd 6.3 on it. ive used it for years and was wondering if there was any possible way i can recover files on it, even though it has been reformatted probably more than 20 times and have had probably 10 - 15 different operating systems on it. is this possible? if so, can someone point me in the right direction... thank you.
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If you want to recover only text, you could use dd(1) on the whole disk and strings(1) to see and store and all text to another computer or disk.
Other formats will be very difficult
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You don't need to be a genius to debug a pf.conf firewall ruleset, you just need the guts to run tcpdump |
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No disrespect or offense meant LateNiteTV, but I do think this is the craziest question I've read in a long time....
If the disk has been reformatted numerous times and had several OSes installed on it after FreeBSD was 'overwritten', the only reliable method is via backups. One good thing about backups, you generally can be sure of what you will get back out of them, with suitable storage....
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My Journal Thou shalt check the array bounds of all strings (indeed, all arrays), for surely where thou typest ``foo'' someone someday shall type ``supercalifragilisticexpialidocious''. |
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Quote:
http://www.daemonforums.org/showpost...97&postcount=4 Quote:
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lol gracias!!!
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The last paragraph in robbak's post is a work of fiction, government agencies overwrite data multiple times because they're paranoid, absolute recovery is likely impossible.. determining the previous state of a single bit alone is theoretical, actually restoring enough of an original bit pattern would be improbable.
For example, the ksh shell on OpenBSD 4.3 is 324,992 bytes in length, 324,992*8 = 2,599,936 bits arranged in a unique pattern to form the executable. I've yet to find any concrete evidence that recovery of data after being overwritten is possible.. Last edited by BSDfan666; 27th August 2008 at 01:12 AM. |
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Quote:
For the defence, I present http://www.usenix.org/publications/l...ann/index.html And for the prosecution, http://www.nber.org/sys-admin/overwr...a-gutmann.html Note that, with most text-based data, if you could get four bytes out of 5, you would have enough to recover the material. Bitwize, I'd back myself to read ascii with an average of one error bit in 16 any day.
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good stuff, thanks guys.
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