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Forum Discussion
can data be recovered from a single failed drive?
The question is almost, but not quite, as dumb as it sounds. I have an Ultra 6+ with a single x-raid-2 volume comprised of four 3TB drives. One drive failed, and is no longer recognized by the R...
4 drives means raid 5 right ?
As far as I know raid 5 is totally unrecoverable if you have more than one drive failing. If you have four drives they'll have about 1/3 of you data (the fourth drive being a backup).
So what they'll have is that equation : x+y+z=s
I know how to retrieve the value of any of those letters from the three other ones, if you don't have the other values I don't see how you can do it. Let's say the disk you give them contains the value 20, it can be 1+1+18 or 7+7+6 or 5+5+10. So as far as I'm concerned, except if this was written sequentially, and I believe only JBOD does this, data is unrecoverable.
They also are not interested in your data, unless you are really famous, imagine the number of drives they have to inspect each day. I think they'll just plug the disk, check there is no sign of bad treatment and trash it right away. I also think they have a non-disclosure agreement which is pretty automatic in many jobs nowadays, so even if they did retrieve data, they wouldn't be allowed to use it anywhere.
Unless I missed something (which is always possible) I don't think you put your data at risk sending them only this drive. if you were to send them 3 drives out of four however...
As far as I know raid 5 is totally unrecoverable if you have more than one drive failing. If you have four drives they'll have about 1/3 of you data (the fourth drive being a backup).
So what they'll have is that equation : x+y+z=s
I know how to retrieve the value of any of those letters from the three other ones, if you don't have the other values I don't see how you can do it. Let's say the disk you give them contains the value 20, it can be 1+1+18 or 7+7+6 or 5+5+10. So as far as I'm concerned, except if this was written sequentially, and I believe only JBOD does this, data is unrecoverable.
They also are not interested in your data, unless you are really famous, imagine the number of drives they have to inspect each day. I think they'll just plug the disk, check there is no sign of bad treatment and trash it right away. I also think they have a non-disclosure agreement which is pretty automatic in many jobs nowadays, so even if they did retrieve data, they wouldn't be allowed to use it anywhere.
Unless I missed something (which is always possible) I don't think you put your data at risk sending them only this drive. if you were to send them 3 drives out of four however...
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