OS X Partition Overwritten by OpenBSD without confirm testdisk says can't recover

How to use TestDisk to recover lost partition
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vssdeo
Posts: 2
Joined: 29 Sep 2018, 10:54

OS X Partition Overwritten by OpenBSD without confirm testdisk says can't recover

#1 Post by vssdeo »

Hi.

Here are the steps to my blunder on OS X High Sierra, Mac Book Air late 2015, 128 GB SSD Hard Disk. Since I am on road and away from my desk any help would be great.

The last structure was (What I remember) The partition is standard with what a new Mac Book Air comes with for 128 GB SSD except for a 8 GB partition I had done later with diskutility app which comes with OS X.

1. EFI
2. OS X HFS 113 GB
3. ext4 8GB

I was trying to install OpenBSD or rather check. As soon as I selected the main disk by mistake (I didn't even commit a write), I just exited the install program. Only later I realized that the partition had been over written with
1. EFI
2. OPEN BSD

So NO format was done, nor any partition table committed hence I have a little hope on recovery. On using testdisk I see the message below, So I don't know how to proceed. The HDF also shown as D^D.

"The following partitions can't be recovered:
Mac HFS 178007028 2401529849 2223522822 [D]
HFS blocksize=67108864, 1138 GB / 1060 GiB
Mac HFS 236978132 238247667 1269536
HFS+ blocksize=4096, 650 MB / 619 MiB"



a) Atttached is the screenshot of test disk
b) Below is the text of testdisk.log

--------------------------------------LOG-------------------------------------

Sat Sep 29 09:21:16 2018
Command line: TestDisk

TestDisk 7.0, Data Recovery Utility, April 2015
Christophe GRENIER <grenier@cgsecurity.org>
http://www.cgsecurity.org
OS: Linux, kernel 4.15.0-20-generic (#21-Ubuntu SMP Tue Apr 24 06:16:15 UTC 2018) x86_64
Compiler: GCC 4.4
Compilation date: 2015-04-18T13:05:16
ext2fs lib: 1.42.8, ntfs lib: libntfs-3g, reiserfs lib: 0.3.1-rc8, ewf lib: 20120504, curses lib: ncurses 5.7
/dev/sda: LBA, HPA, LBA48, DCO support
/dev/sda: size 236978176 sectors
/dev/sda: user_max 236978176 sectors
/dev/sda: native_max 236978176 sectors
/dev/sda: dco 236978176 sectors
Warning: can't get size for Disk /dev/mapper/control - 0 B - 0 sectors, sector size=512
Hard disk list
Disk /dev/sda - 121 GB / 113 GiB - CHS 14751 255 63, sector size=512 - APPLE SSD SM0128G, S/N:S2XUNY6HB81414, FW:BXZ33A0Q
Disk /dev/sdc - 31 GB / 29 GiB - CHS 30436 64 32, sector size=512 - USB Mass Storage Device

Partition table type (auto): EFI GPT
Disk /dev/sda - 121 GB / 113 GiB - APPLE SSD SM0128G
Partition table type: EFI GPT

Analyse Disk /dev/sda - 121 GB / 113 GiB - CHS 14751 255 63
hdr_size=92
hdr_lba_self=1
hdr_lba_alt=236978175 (expected 236978175)
hdr_lba_start=64
hdr_lba_end=236978112
hdr_lba_table=2
hdr_entries=128
hdr_entsz=128
Current partition structure:
2 P EFI System 64 1023 960 [EFI System Area]
4 P Unknown 1024 236978112 236977089 [OpenBSD Area]

search_part()
Disk /dev/sda - 121 GB / 113 GiB - CHS 14751 255 63
FAT32 at 0/0/41
check_FAT: Unusual media descriptor (0xf0!=0xf8)
FAT1 : 32-3182
FAT2 : 3183-6333
start_rootdir : 6334 root cluster : 2
Data : 6334-409599
sectors : 409600
cluster_size : 1
no_of_cluster : 403266 (2 - 403267)
fat_length 3151 calculated 3151
heads/cylinder 16 (FAT) != 255 (HD)
sect/track 32 (FAT) != 63 (HD)

FAT32 at 0/0/41
EFI System 40 409639 409600 [EFI]
FAT32, blocksize=512, 209 MB / 200 MiB

LVM magic value at 2937/145/16

LVM magic value at 4760/201/5

LVM magic value at 4760/201/6

LVM magic value at 4760/201/10

HFS magic value at 11080/108/25
part_size 2223522822
Mac HFS 178007028 2401529849 2223522822 [D]
HFS blocksize=67108864, 1138 GB / 1060 GiB
This partition ends after the disk limits. (start=178007028, size=2223522822, end=2401529849, disk end=236978176)

HFS magic value at 11080/108/27

recover_EXT2: s_block_group_nr=0/53, s_mnt_count=0/4294967295, s_blocks_per_group=32768, s_inodes_per_group=8160
recover_EXT2: s_blocksize=4096
recover_EXT2: s_blocks_count 1761665
recover_EXT2: part_size 14093320
MS Data 222622672 236715991 14093320
ext4 blocksize=4096 Large_file Sparse_SB, 7215 MB / 6881 MiB

HFS+ magic value at 14751/52/42
part_size 1269536
Mac HFS 236978132 238247667 1269536
HFS+ blocksize=4096, 650 MB / 619 MiB
This partition ends after the disk limits. (start=236978132, size=1269536, end=238247667, disk end=236978176)

HFS+ magic value at 14751/52/44
part_size 1269536
Mac HFS 235708600 236978135 1269536
HFS+ found using backup sector!, 650 MB / 619 MiB
Disk /dev/sda - 121 GB / 113 GiB - CHS 14751 255 63
Check the harddisk size: HD jumpers settings, BIOS detection...
The harddisk (121 GB / 113 GiB) seems too small! (< 1229 GB / 1145 GiB)
The following partitions can't be recovered:
Mac HFS 178007028 2401529849 2223522822 [D]
HFS blocksize=67108864, 1138 GB / 1060 GiB
Mac HFS 236978132 238247667 1269536
HFS+ blocksize=4096, 650 MB / 619 MiB

Results
P EFI System 40 409639 409600 [EFI]
FAT32, blocksize=512, 209 MB / 200 MiB
MS Data 222622672 236715991 14093320
ext4 blocksize=4096 Large_file Sparse_SB, 7215 MB / 6881 MiB
Mac HFS 235708600 236978135 1269536
HFS+ found using backup sector!, 650 MB / 619 MiB

Hint for advanced users. dmsetup may be used if you prefer to avoid to rewrite the partition table for the moment:
echo "0 409600 linear /dev/sda 40" | dmsetup create test0
echo "0 14093320 linear /dev/sda 222622672" | dmsetup create test1
echo "0 1269536 linear /dev/sda 235708600" | dmsetup create test2

interface_write()
1 P EFI System 40 409639 409600 [EFI]
simulate write!

Analyse Disk /dev/sda - 121 GB / 113 GiB - CHS 14751 255 63
hdr_size=92
hdr_lba_self=1
hdr_lba_alt=236978175 (expected 236978175)
hdr_lba_start=64
hdr_lba_end=236978112
hdr_lba_table=2
hdr_entries=128
hdr_entsz=128
Current partition structure:
2 P EFI System 64 1023 960 [EFI System Area]
4 P Unknown 1024 236978112 236977089 [OpenBSD Area]

search_part()
Disk /dev/sda - 121 GB / 113 GiB - CHS 14751 255 63
FAT32 at 0/0/41
check_FAT: Unusual media descriptor (0xf0!=0xf8)
FAT1 : 32-3182
FAT2 : 3183-6333
start_rootdir : 6334 root cluster : 2
Data : 6334-409599
sectors : 409600
cluster_size : 1
no_of_cluster : 403266 (2 - 403267)
fat_length 3151 calculated 3151
heads/cylinder 16 (FAT) != 255 (HD)
sect/track 32 (FAT) != 63 (HD)

FAT32 at 0/0/41
EFI System 40 409639 409600 [EFI]
FAT32, blocksize=512, 209 MB / 200 MiB

LVM magic value at 2937/145/16

LVM magic value at 4760/201/5

LVM magic value at 4760/201/6

LVM magic value at 4760/201/10

HFS magic value at 11080/108/25
part_size 2223522822
Mac HFS 178007028 2401529849 2223522822 [D]
HFS blocksize=67108864, 1138 GB / 1060 GiB
This partition ends after the disk limits. (start=178007028, size=2223522822, end=2401529849, disk end=236978176)

HFS magic value at 11080/108/27

recover_EXT2: s_block_group_nr=0/53, s_mnt_count=0/4294967295, s_blocks_per_group=32768, s_inodes_per_group=8160
recover_EXT2: s_blocksize=4096
recover_EXT2: s_blocks_count 1761665
recover_EXT2: part_size 14093320
MS Data 222622672 236715991 14093320
ext4 blocksize=4096 Large_file Sparse_SB, 7215 MB / 6881 MiB

HFS+ magic value at 14751/52/42
part_size 1269536
Mac HFS 236978132 238247667 1269536
HFS+ blocksize=4096, 650 MB / 619 MiB
This partition ends after the disk limits. (start=236978132, size=1269536, end=238247667, disk end=236978176)

HFS+ magic value at 14751/52/44
part_size 1269536
Mac HFS 235708600 236978135 1269536
HFS+ found using backup sector!, 650 MB / 619 MiB
Disk /dev/sda - 121 GB / 113 GiB - CHS 14751 255 63
Check the harddisk size: HD jumpers settings, BIOS detection...
The harddisk (121 GB / 113 GiB) seems too small! (< 1229 GB / 1145 GiB)
The following partitions can't be recovered:
Mac HFS 178007028 2401529849 2223522822 [D]
HFS blocksize=67108864, 1138 GB / 1060 GiB
Mac HFS 236978132 238247667 1269536
HFS+ blocksize=4096, 650 MB / 619 MiB

Results
P EFI System 40 409639 409600 [EFI]
FAT32, blocksize=512, 209 MB / 200 MiB
MS Data 222622672 236715991 14093320
ext4 blocksize=4096 Large_file Sparse_SB, 7215 MB / 6881 MiB
Mac HFS 235708600 236978135 1269536
HFS+ found using backup sector!, 650 MB / 619 MiB

Hint for advanced users. dmsetup may be used if you prefer to avoid to rewrite the partition table for the moment:
echo "0 409600 linear /dev/sda 40" | dmsetup create test0
echo "0 14093320 linear /dev/sda 222622672" | dmsetup create test1
echo "0 1269536 linear /dev/sda 235708600" | dmsetup create test2

interface_write()
1 P EFI System 40 409639 409600 [EFI]

search_part()
Disk /dev/sda - 121 GB / 113 GiB - CHS 14751 255 63
FAT32 at 0/0/41
check_FAT: Unusual media descriptor (0xf0!=0xf8)
FAT1 : 32-3182
FAT2 : 3183-6333
start_rootdir : 6334 root cluster : 2
Data : 6334-409599
sectors : 409600
cluster_size : 1
no_of_cluster : 403266 (2 - 403267)
fat_length 3151 calculated 3151
heads/cylinder 16 (FAT) != 255 (HD)
sect/track 32 (FAT) != 63 (HD)

FAT32 at 0/0/41
EFI System 40 409639 409600 [EFI]
FAT32, blocksize=512, 209 MB / 200 MiB
FAT32 at 0/0/47
check_FAT: Unusual media descriptor (0xf0!=0xf8)
FAT1 : 32-3182
FAT2 : 3183-6333
start_rootdir : 6334 root cluster : 2
Data : 6334-409599
sectors : 409600
cluster_size : 1
no_of_cluster : 403266 (2 - 403267)
fat_length 3151 calculated 3151
heads/cylinder 16 (FAT) != 255 (HD)
sect/track 32 (FAT) != 63 (HD)
set_FAT_info: name from BS used

FAT32 at 0/0/47
EFI System 46 409645 409600 [EFI]
FAT32, blocksize=512, 209 MB / 200 MiB

LVM magic value at 2937/145/16

LVM magic value at 4760/201/5

LVM magic value at 4760/201/6

LVM magic value at 4760/201/10

HFS magic value at 11080/108/25
part_size 2223522822
Mac HFS 178007028 2401529849 2223522822 [D]
HFS blocksize=67108864, 1138 GB / 1060 GiB
This partition ends after the disk limits. (start=178007028, size=2223522822, end=2401529849, disk end=236978176)

HFS magic value at 11080/108/27

recover_EXT2: s_block_group_nr=0/53, s_mnt_count=0/4294967295, s_blocks_per_group=32768, s_inodes_per_group=8160
recover_EXT2: s_blocksize=4096
recover_EXT2: s_blocks_count 1761665
recover_EXT2: part_size 14093320
MS Data 222622672 236715991 14093320
ext4 blocksize=4096 Large_file Sparse_SB, 7215 MB / 6881 MiB

block_group_nr 1

recover_EXT2: "e2fsck -b 32768 -B 4096 device" may be needed
recover_EXT2: s_block_group_nr=1/53, s_mnt_count=0/4294967295, s_blocks_per_group=32768, s_inodes_per_group=8160
recover_EXT2: s_blocksize=4096
recover_EXT2: s_blocks_count 1761665
recover_EXT2: part_size 14093320
MS Data 222622670 236715989 14093320
ext4 blocksize=4096 Large_file Sparse_SB Backup_SB, 7215 MB / 6881 MiB

block_group_nr 1

recover_EXT2: "e2fsck -b 32768 -B 4096 device" may be needed
recover_EXT2: s_block_group_nr=1/53, s_mnt_count=0/4294967295, s_blocks_per_group=32768, s_inodes_per_group=8160
recover_EXT2: s_blocksize=4096
recover_EXT2: s_blocks_count 1761665
recover_EXT2: part_size 14093320
MS Data 222622672 236715991 14093320
ext4 blocksize=4096 Large_file Sparse_SB Backup_SB, 7215 MB / 6881 MiB

block_group_nr 3

recover_EXT2: "e2fsck -b 98304 -B 4096 device" may be needed
recover_EXT2: s_block_group_nr=3/53, s_mnt_count=0/4294967295, s_blocks_per_group=32768, s_inodes_per_group=8160
recover_EXT2: s_blocksize=4096
recover_EXT2: s_blocks_count 1761665
recover_EXT2: part_size 14093320
MS Data 222622670 236715989 14093320
ext4 blocksize=4096 Large_file Sparse_SB Backup_SB, 7215 MB / 6881 MiB

block_group_nr 3

recover_EXT2: "e2fsck -b 98304 -B 4096 device" may be needed
recover_EXT2: s_block_group_nr=3/53, s_mnt_count=0/4294967295, s_blocks_per_group=32768, s_inodes_per_group=8160
recover_EXT2: s_blocksize=4096
recover_EXT2: s_blocks_count 1761665
recover_EXT2: part_size 14093320
MS Data 222622672 236715991 14093320
ext4 blocksize=4096 Large_file Sparse_SB Backup_SB, 7215 MB / 6881 MiB

block_group_nr 5

recover_EXT2: "e2fsck -b 163840 -B 4096 device" may be needed
recover_EXT2: s_block_group_nr=5/53, s_mnt_count=0/4294967295, s_blocks_per_group=32768, s_inodes_per_group=8160
recover_EXT2: s_blocksize=4096
recover_EXT2: s_blocks_count 1761665
recover_EXT2: part_size 14093320
MS Data 222622670 236715989 14093320
ext4 blocksize=4096 Large_file Sparse_SB Backup_SB, 7215 MB / 6881 MiB

block_group_nr 5

recover_EXT2: "e2fsck -b 163840 -B 4096 device" may be needed
recover_EXT2: s_block_group_nr=5/53, s_mnt_count=0/4294967295, s_blocks_per_group=32768, s_inodes_per_group=8160
recover_EXT2: s_blocksize=4096
recover_EXT2: s_blocks_count 1761665
recover_EXT2: part_size 14093320
MS Data 222622672 236715991 14093320
ext4 blocksize=4096 Large_file Sparse_SB Backup_SB, 7215 MB / 6881 MiB

block_group_nr 7

recover_EXT2: "e2fsck -b 229376 -B 4096 device" may be needed
recover_EXT2: s_block_group_nr=7/53, s_mnt_count=0/4294967295, s_blocks_per_group=32768, s_inodes_per_group=8160
recover_EXT2: s_blocksize=4096
recover_EXT2: s_blocks_count 1761665
recover_EXT2: part_size 14093320
MS Data 222622670 236715989 14093320
ext4 blocksize=4096 Large_file Sparse_SB Backup_SB, 7215 MB / 6881 MiB

block_group_nr 7

recover_EXT2: "e2fsck -b 229376 -B 4096 device" may be needed
recover_EXT2: s_block_group_nr=7/53, s_mnt_count=0/4294967295, s_blocks_per_group=32768, s_inodes_per_group=8160
recover_EXT2: s_blocksize=4096
recover_EXT2: s_blocks_count 1761665
recover_EXT2: part_size 14093320
MS Data 222622672 236715991 14093320
ext4 blocksize=4096 Large_file Sparse_SB Backup_SB, 7215 MB / 6881 MiB

block_group_nr 9

recover_EXT2: "e2fsck -b 294912 -B 4096 device" may be needed
recover_EXT2: s_block_group_nr=9/53, s_mnt_count=0/4294967295, s_blocks_per_group=32768, s_inodes_per_group=8160
recover_EXT2: s_blocksize=4096
recover_EXT2: s_blocks_count 1761665
recover_EXT2: part_size 14093320
MS Data 222622670 236715989 14093320
ext4 blocksize=4096 Large_file Sparse_SB Backup_SB, 7215 MB / 6881 MiB

block_group_nr 9

recover_EXT2: "e2fsck -b 294912 -B 4096 device" may be needed
recover_EXT2: s_block_group_nr=9/53, s_mnt_count=0/4294967295, s_blocks_per_group=32768, s_inodes_per_group=8160
recover_EXT2: s_blocksize=4096
recover_EXT2: s_blocks_count 1761665
recover_EXT2: part_size 14093320
MS Data 222622672 236715991 14093320
ext4 blocksize=4096 Large_file Sparse_SB Backup_SB, 7215 MB / 6881 MiB

block_group_nr 25

recover_EXT2: "e2fsck -b 819200 -B 4096 device" may be needed
recover_EXT2: s_block_group_nr=25/53, s_mnt_count=0/4294967295, s_blocks_per_group=32768, s_inodes_per_group=8160
recover_EXT2: s_blocksize=4096
recover_EXT2: s_blocks_count 1761665
recover_EXT2: part_size 14093320
MS Data 222622670 236715989 14093320
ext4 blocksize=4096 Large_file Sparse_SB Backup_SB, 7215 MB / 6881 MiB

block_group_nr 25

recover_EXT2: "e2fsck -b 819200 -B 4096 device" may be needed
recover_EXT2: s_block_group_nr=25/53, s_mnt_count=0/4294967295, s_blocks_per_group=32768, s_inodes_per_group=8160
recover_EXT2: s_blocksize=4096
recover_EXT2: s_blocks_count 1761665
recover_EXT2: part_size 14093320
MS Data 222622672 236715991 14093320
ext4 blocksize=4096 Large_file Sparse_SB Backup_SB, 7215 MB / 6881 MiB

block_group_nr 27

recover_EXT2: "e2fsck -b 884736 -B 4096 device" may be needed
recover_EXT2: s_block_group_nr=27/53, s_mnt_count=0/4294967295, s_blocks_per_group=32768, s_inodes_per_group=8160
recover_EXT2: s_blocksize=4096
recover_EXT2: s_blocks_count 1761665
recover_EXT2: part_size 14093320
MS Data 222622670 236715989 14093320
ext4 blocksize=4096 Large_file Sparse_SB Backup_SB, 7215 MB / 6881 MiB

block_group_nr 27

recover_EXT2: "e2fsck -b 884736 -B 4096 device" may be needed
recover_EXT2: s_block_group_nr=27/53, s_mnt_count=0/4294967295, s_blocks_per_group=32768, s_inodes_per_group=8160
recover_EXT2: s_blocksize=4096
recover_EXT2: s_blocks_count 1761665
recover_EXT2: part_size 14093320
MS Data 222622672 236715991 14093320
ext4 blocksize=4096 Large_file Sparse_SB Backup_SB, 7215 MB / 6881 MiB

block_group_nr 49

recover_EXT2: "e2fsck -b 1605632 -B 4096 device" may be needed
recover_EXT2: s_block_group_nr=49/53, s_mnt_count=0/4294967295, s_blocks_per_group=32768, s_inodes_per_group=8160
recover_EXT2: s_blocksize=4096
recover_EXT2: s_blocks_count 1761665
recover_EXT2: part_size 14093320
MS Data 222622670 236715989 14093320
ext4 blocksize=4096 Large_file Sparse_SB Backup_SB, 7215 MB / 6881 MiB

block_group_nr 49

recover_EXT2: "e2fsck -b 1605632 -B 4096 device" may be needed
recover_EXT2: s_block_group_nr=49/53, s_mnt_count=0/4294967295, s_blocks_per_group=32768, s_inodes_per_group=8160
recover_EXT2: s_blocksize=4096
recover_EXT2: s_blocks_count 1761665
recover_EXT2: part_size 14093320
MS Data 222622672 236715991 14093320
ext4 blocksize=4096 Large_file Sparse_SB Backup_SB, 7215 MB / 6881 MiB

HFS+ magic value at 14751/52/42
part_size 1269536
Mac HFS 236978132 238247667 1269536
HFS+ blocksize=4096, 650 MB / 619 MiB
This partition ends after the disk limits. (start=236978132, size=1269536, end=238247667, disk end=236978176)

HFS+ magic value at 14751/52/44
part_size 1269536
Mac HFS 235708600 236978135 1269536
HFS+ found using backup sector!, 650 MB / 619 MiB
Disk /dev/sda - 121 GB / 113 GiB - CHS 14751 255 63
Check the harddisk size: HD jumpers settings, BIOS detection...
The harddisk (121 GB / 113 GiB) seems too small! (< 1229 GB / 1145 GiB)
The following partitions can't be recovered:
Mac HFS 178007028 2401529849 2223522822 [D]
HFS blocksize=67108864, 1138 GB / 1060 GiB
Mac HFS 236978132 238247667 1269536
HFS+ blocksize=4096, 650 MB / 619 MiB

Results
EFI System 40 409639 409600 [EFI]
FAT32, blocksize=512, 209 MB / 200 MiB
EFI System 46 409645 409600 [EFI]
FAT32, blocksize=512, 209 MB / 200 MiB
MS Data 222622670 236715989 14093320
ext4 blocksize=4096 Large_file Sparse_SB Backup_SB, 7215 MB / 6881 MiB
MS Data 222622672 236715991 14093320
ext4 blocksize=4096 Large_file Sparse_SB, 7215 MB / 6881 MiB
Mac HFS 235708600 236978135 1269536
HFS+ found using backup sector!, 650 MB / 619 MiB

Hint for advanced users. dmsetup may be used if you prefer to avoid to rewrite the partition table for the moment:
echo "0 409600 linear /dev/sda 40" | dmsetup create test0
echo "0 409600 linear /dev/sda 46" | dmsetup create test1
echo "0 14093320 linear /dev/sda 222622670" | dmsetup create test2
echo "0 14093320 linear /dev/sda 222622672" | dmsetup create test3
echo "0 1269536 linear /dev/sda 235708600" | dmsetup create test4

interface_write()

No partition found or selected for recovery
simulate write!

TestDisk exited normally.
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cgrenier
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Joined: 18 Feb 2012, 15:08
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Re: OS X Partition Overwritten by OpenBSD without confirm testdisk says can't recover

#2 Post by cgrenier »

The mainsuperblock of the HFS+ filesystem has probably been overwritten.
If the HFS+ partition was just after the EFI partition. We will have
EFI System 40 409639 409600 [EFI]
FAT32, blocksize=512, 209 MB / 200 MiB

Mac HFS 409640 2223932461 2223522822 [D]
HFS blocksize=67108864, 1138 GB / 1060 GiB

MS Data 222622672 236715991 14093320
ext4 blocksize=4096 Large_file Sparse_SB, 7215 MB / 6881 MiB

But the HFS+ and the ext4 filesystem will overlaps! So I don't know the exact location and size of the HFS+ partition.
You can always use PhotoRec to recover your data without the original filenames but try other data recovery utility, you may have better results.
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vssdeo
Posts: 2
Joined: 29 Sep 2018, 10:54

Re: OS X Partition Overwritten by OpenBSD without confirm testdisk says can't recover

#3 Post by vssdeo »

Thank you so much for your time and reply, I just have a follow up question: The ext4 partition does not matter to me as it was empty. Is it possible to specify a partition table overwrite where after standard EFI, the rest till the end of disk is considered part of HFS+.
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