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覆盖硬盘的第一个 MB 后无法识别分区表。如何恢复数据

tag-icon • tag-icon boot data-recovery partitioning boot-partition data-corruption
覆盖硬盘的第一个 MB 后无法识别分区表。如何恢复数据

我的 GRUB 分区大小为 1 MB，起始于第 2049 块。我的 BIOS 无法识别它，因此我决定使用以下命令将其移动到磁盘的开头

dd if=/dev/sda5 of=/dev/sda bs=512 count=2048

现在我根本看不到分区。操作前，前 2048 个段（1MB）根本没有格式化，parted 无法识别。

我在其他磁盘 dev/sdc 中创建了一个映像，并在映像上运行了 gdisk

sudo gdisk -l /dev/sdc
GPT fdisk (gdisk) version 0.8.8

Caution: invalid main GPT header, but valid backup; regenerating main header from backup!

Caution! After loading partitions, the CRC doesn't check out!
Warning! Main partition table CRC mismatch! Loaded backup partition table instead of main partition table!

Warning! One or more CRCs don't match. You should repair the disk!

Partition table scan:
  MBR: not present
  BSD: not present
  APM: not present
  GPT: damaged

Found invalid MBR and corrupt GPT. What do you want to do? (Using the GPT MAY permit recovery of GPT data.)
 1 - Use current GPT
 2 - Create blank GPT

Your answer: 1
Disk /dev/sdc: 1953525168 sectors, 931.5 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 6FEB1F15-70D6-42F9-A4B8-6E960B8C65F5
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 1953525134
Partitions will be aligned on 2048-sector boundaries
Total free space is 3437 sectors (1.7 MiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1            4096      1887105023   899.8 GiB   8300  
   2      1887105024      1920333823   15.8 GiB    8300  
   3      1920333824      1944627199   11.6 GiB    8300  
   4      1944627200      1953523711   4.2 GiB     8200  
   5            2048            4095   1024.0 KiB  EF02

sfdisk -l /dev/sdc 输出仍然是

WARNING: GPT (GUID Partition Table) detected on '/dev/sdc'! The util sfdisk doesn't support GPT. Use GNU Parted.


Disk /dev/sdc: 121601 cylinders, 255 heads, 63 sectors/track

sfdisk: ERROR: sector 0 does not have an msdos signature /dev/sdc: unrecognized partition table type

No partitions found

fsck -y /dev/sdc 说

sudo fsck -y /dev/sdc
fsck from util-linux 2.20.1
e2fsck 1.42.9 (4-Feb-2014)
ext2fs_open2: Bad magic number in super-block
fsck.ext2: Superbloque es inválido, intentando los bloques de respaldo...
fsck.ext2: Bad magic number in super-block mientras se intentaba abrir /dev/sdc

 The superbloque could not be read or does not describe a valid ext2/ext3/ext4
 sistema de ficheros.  If the dispositivo is valid and it really contains an ext2/ext3/ext4
 sistema de ficheros (and not swap or ufs or something else), then the superbloque
 is corrupt, and you might try running e2fsck with an alternate superbloque:
     e2fsck -b 8193 <dispositivo>
 or
     e2fsck -b 32768 <dispositivo>

有没有办法恢复我的分区或至少我的数据？我想在这些第一段中写一些其他内容应该可行。

最好的，

朱利安

答案1

使用实时 USB 中的 gdisk 解决

sudo gdisk /dev/sda

1 选项 b 将 USB 磁盘上的分区表保存为 sda.gpt​​ 文件

2 选项 r

3 选项 l 从 USB 驱动器加载保存的 sda.gpt​​ 文件

3 选择 w 完成

瞧！

在此之前，我使用 gddrescue 进行了备份

sudo apt-get install gddrescue
sudo ddrescue -f -r3 /dev/sda /dev/sdc PATH$/mapfile

并在 /dev/sdc 上试验性地执行上述步骤。

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