修复graid微型磁盘上损坏的GPT分区

Question

我试图修复一个GPT损坏的分区表上的一个灰色迷你1TB外部硬盘驱动器。以下是gdisk的报告：

root@philippe-desktop:/home/philippe/thomasdisk# gdisk /dev/sdb
GPT fdisk (gdisk) version 0.8.8

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

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

****************************************************************************
Caution: Found protective or hybrid MBR and corrupt GPT. Using GPT, but disk
verification and recovery are STRONGLY recommended.
****************************************************************************

Command (? for help): ?
b   back up GPT data to a file
c   change a partition's name
d   delete a partition
i   show detailed information on a partition
l   list known partition types
n   add a new partition
o   create a new empty GUID partition table (GPT)
p   print the partition table
q   quit without saving changes
r   recovery and transformation options (experts only)
s   sort partitions
t   change a partition's type code
v   verify disk
w   write table to disk and exit
x   extra functionality (experts only)
?   print this menu

Command (? for help): v

No problems found. 262157 free sectors (128.0 MiB) available in 2
segments, the largest of which is 262151 (128.0 MiB) in size.

Command (? for help): p
Disk /dev/sdb: 1953546304 sectors, 931.5 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): FE2326A4-F411-489E-B0D9-D2D9EF21A00C
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 1953546270
Partitions will be aligned on 8-sector boundaries
Total free space is 262157 sectors (128.0 MiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1              40          409639   200.0 MiB   EF00  EFI System Partition
   2          409640      1953284119   931.2 GiB   AF00  G-RAID mini

Command (? for help):

据我的理解，gdisk能够自动解决损坏问题，只需按w就可以修复我的磁盘，但我不确定，因为通常v (验证)选项应该会向我提出撤销选项。

我能安全地去按w吗？我已经做过sgdisk -b backup.gpt /dev/sdb了

如果这个问题没有主题，请把我转到正确的网站。

Answer 1

如果您花几分钟阅读上面的输出，您会发现gdisk正在告诉您该做什么(它发现了一个问题：invalid main GPT header, but valid backup;，并为您执行了一个操作：regenerating main header from backup! )。它还提出了一个建议：disk verification and recovery are STRONGLY recommended. --您可能应该遵循推荐)。

基于验证没有返回任何问题这一事实，您可能可以写出分区布局--我的理解是，gdisk将使用并写出重新生成的GPT数据。

如果要在操作中显式显示，则恢复菜单有一个选项可以使用备份GPT标头(重新构建/替换主GPT标头)，可以具体调用该选项，这似乎是要采取的正确操作(假设上面看到的GPT布局看起来很正常--否则您可能必须手动重新构建分区布局)。