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I had a working system with dual boot of Win 10 and Ubuntu 18.04 on a single hard disk with the following partition layout (more or less, that is what I remember): - Primary NTFS, 1.5gb boot - Primary NTFS, 120gb win10 - Primary Linux, 100gb Ubuntu, divided to 3 partitions: * Extended 2gb where /boot is mounted * Logical 20gb where / is mounted (OS) * Logical 100gb where /home is mounted

I needed more space for the Ubuntu partition, so I resized the win10 partition. I don't remember if I did it from Ubuntu or win10, but after that Ubuntu stopped booting. I managed to fix it using testdisk, but then win10 stopped booting. The situation now is that when I recover the win10 partition using testdisk it boots, but Ubuntu doesn't. When I recover the Ubuntu partition (also with testdisk) it boots, but win10 doesn't.

Currently I'm in the "win10 boots and Ubuntu doesn't" state. When I boot with a Ubuntu Live CD, this is the output of fdisk -l /dev/sda:

Disk /dev/sda: 232.9 GiB, 250059350016 bytes, 488397168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x8f76ec72

Device     Boot     Start       End   Sectors   Size Id Type
/dev/sda1  *         2048   3074047   3072000   1.5G  7 HPFS/NTFS/exFAT
/dev/sda2         3084480 244380779 241296300 115.1G  7 HPFS/NTFS/exFAT
/dev/sda3       244381696 248381439   3999744   1.9G 83 Linux

So the 2 partitions at the start of the disk are identified correctly, but 2 out of 3 linux partitions aren't.

The analysis of testdisk is:

Disk /dev/sda - 250 GB / 232 GiB - CHS 30401 255 63

     Partition                  Start        End    Size in sectors

 1 * HPFS - NTFS              0  32 33   191  89 26    3072000
 2 P HPFS - NTFS            191  89 27 12602  29 35  199378944
 3 P Linux                15212  14 35 15461   7 34    3999744
 4 E extended LBA         15461   7 35 30401  75 10  240015360
 5 L Linux                15461  40  4 17911 157 38   39366656
 6 L Linux                19903 134  8 30401  75 10  168646656

So it identifies correctly the linux partition structure, but if I recover it it messes the windows partitions. Note that in this situation the win10 partition has its size before I shrinked it (~120gb) but testdisk identifies it with size after the shrinking (~100gb)

Any way to recover it correctly?

Itamar Katz
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1 Answers1

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I ended up giving testdisk another try. This time I used the 'deep search' option and got a huge list of deleted partitions. Luckily only 1 combination of the resized Win10 partition + Linux extended partition fitted what I remembered was the situation before I attempted the resize. So I backed up the whole drive, and gave it a try. It worked.

Itamar Katz
  • 171
  • 5