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I was starting a backup of Acer's factory restore partition located inside of an extended partition to determine whether or not it still worked. I clicked "take no action" once I saw that it had, in fact, successfully started up. However, when I rebooted, I got an "error: no such partition" and was dropped to a GRUB recovery prompt.

Upon further investigation, I discovered that all partitions inside the extended partition were gone except for the recovery partition!

What GParted sees when looking at the disk layout

What happened? How can I fix this? testdisk doesn't find the deleted partitions!

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Since this is practically a bug report, anyone who wishes to vote to close may do so. I can't decide. –  WindowsEscapist Jul 1 '13 at 22:08
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Alright, close! Hehe, just kidding. Actually this is a serious, legitimate question. It is indeed a possible bug report, but you are also asking how to recover your partition, which is not a bug report. From your description, it sounds like the recovery programs is seriously buggy if it made changes (and destructive ones no less) when it shouldn’t have. –  Synetech Jul 1 '13 at 22:18
    
Okay! Thanks for the closure. (That was necessary :D) –  WindowsEscapist Jul 2 '13 at 19:46

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I ended up using testdisk to recover the partitions. This took a long time, and I asked a question about it here.

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I ended up using testdisk to recover the partitions. This took a long time I can imagine. This is one of the downsides of larger disks; data-recovery is infeasible. ಠ_ಠ –  Synetech Jul 1 '13 at 22:19

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