如何使用混合MBR修复损坏的GPT？

debugcn 发表于 Dev

me0076

我的SD卡存在一些问题，无法修复。
这是GNOME磁盘中磁盘的外观： Ubuntu磁盘

当我运行时gdisk /dev/sdb，它给出以下输出：

sudo gdisk /dev/sdb
GPT fdisk (gdisk) version 1.0.3

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

Warning! Main and backup partition tables differ! Use the 'c' and 'e' options
on the recovery & transformation menu to examine the two tables.
Warning! One or more CRCs don't match. You should repair the disk!

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

Found valid MBR and corrupt GPT. Which do you want to use? (Using the
GPT MAY permit recovery of GPT data.

我不确定应该使用哪个分区表，但是我使用了GPT（创建空白GPT没有帮助），这是分区的样子：

Command (? for help): p
Disk /dev/sdb: 125067264 sectors, 59.6 GiB
Model: Multi-Card      
Sector size (logical/physical): 512/512 bytes
Disk identifier (GUID): 76A0F070-E171-475B-9409-53840D61AD12
Partition table holds up to 128 entries
Main partition table begins at sector 2 and ends at sector 33
First usable sector is 34, last usable sector is 4194270
Partitions will be aligned on 2048-sector boundaries
Total free space is 671677 sectors (328.0 MiB)


Number  Start (sector)    End (sector)  Size       Code  Name
1            2048           67583   32.0 MiB    0C01  hassos-boot
2           67584          116735   24.0 MiB    8300  hassos-kernel0
3          116736          641023   256.0 MiB   8300  hassos-system0
4          641024          690175   24.0 MiB    8300  hassos-kernel1
5          690176         1214463   256.0 MiB   8300  hassos-system1
6         1214464         1230847   8.0 MiB     8300  hassos-bootstate
7         1230848         1427455   96.0 MiB    8300  hassos-overlay
8         1427456         3524607   1024.0 MiB  8300  hassos-data

当我想验证磁盘时，我将获得此信息：

Caution: The CRC for the backup partition table is invalid. This table may
be corrupt. This program will automatically create a new backup partition
table when you save your partitions.

Problem: The secondary header's self-pointer indicates that it does not reside
at the end of the disk. If you've added a disk to a RAID array, use the 'e'
option on the experts' menu to adjust the secondary header's and partition
table's locations.

Identified 2 problems!

我设法解决了这些问题，然后得到了以下信息：

No problems found. 121544637 free sectors (58.0 GiB) available in 2
segments, the largest of which is 121542623 (58.0 GiB) in size.

但是写完之后我得到了：

 OK: writing new GUID partition table (GPT) to /dev/sdb.
 The operation has completed successfully.

但是，当我再次检查分区时，它仍然相同。我试图一一删除所有分区，然后创建一个新的空GUID分区表，但是在写完之后我得到了：

OK: writing new GUID partition table (GPT) to /dev/sdb.
The operation has completed successfully.

但是，当我再次检查分区时，它仍然相同。我认为这是因为混合MBR和损坏的GPT。有什么办法可以同时删除这两个表？还是我可以做些什么来解决这个问题？

提前致谢

德尔蒂克

我最近实际上也有同样的问题。您的SD卡可能处于某种写保护模式。可能的原因：

闪存已用完，无法再写入。（这不好！）
可以启用物理写保护开关。（将其关闭以再次启用写操作。）

在我的情况下，闪存控制器在闪存发生故障后默默地放弃了我的写操作，因此，即使写操作看起来很成功，损坏的分区表也会在下一次读取时恢复。

如果您的SD卡的状态如此，则很可能是发生了故障，您需要购买一张新的SD卡。

我怀疑您遇到了第一个问题，因为如果写保护开关处于活动状态，您将看到某种“只读”通知，因为Linux可以检测到闪存盘或SD卡是否被写保护。（请参阅/var/log/syslog）

具有写保护的闪存驱动器的示例/dev/sdc：

5月29日18:26:44演示内核：[32319.722491] scsi 2：0：0：0：Direct-Access NA NA 1.26 PQ：0 ANSI：5 
May 29 18:26:44演示内核：[32319.723377] sd 2： 0：0：0：附加的scsi通用sg1类型0 
5月29日18:26:44演示内核：[32319.724325] sd 2：0：0：0：[sdc] 31266816 512字节逻辑块：（16.0 GB / 14.9 GiB ）5月29日18:26:44演示内核：[32319.725131] sd 2：0：0：0：[sdc]写保护于
5月29日18:26:44演示内核：[32319.725137] sd 2：0：0： 0：[sdc]模式检测：43 00 80 00 
May 29 18:26:44演示内核：[32319.725389] sd 2：0：0：0：[sdc]写入缓存：已禁用，读取缓存：已启用，未启用支持DPO或FUA 
5月29日18:26:44演示内核：[32319.737297] sdc：sdc1

5月29日18:26:44演示内核：[32319.739266] sd 2：0：0：0：[sdc]附加的SCSI可移动磁盘

演示版

/dev/sdb 是我坏掉的闪存驱动器，它默默地丢弃了写入。

尝试清除分区表：

root@demo [~]# gdisk /dev/sdb
GPT fdisk (gdisk) version 1.0.3

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

Warning! Main and backup partition tables differ! Use the 'c' and 'e' options
on the recovery & transformation menu to examine the two tables.

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

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

Found valid MBR and corrupt GPT. Which do you want to use? (Using the
GPT MAY permit recovery of GPT data.)
 1 - MBR
 2 - GPT
 3 - Create blank GPT

Your answer: 2

Command (? for help): p
Disk /dev/sdb: 7897087 sectors, 3.8 GiB
Model: USB Flash Disk
Sector size (logical/physical): 512/512 bytes
Disk identifier (GUID): 5904C65E-B410-474D-B22F-9FEA7E3582C2
Partition table holds up to 128 entries
Main partition table begins at sector 2 and ends at sector 33
First usable sector is 34, last usable sector is 7897053
Partitions will be aligned on 2048-sector boundaries
Total free space is 2014 sectors (1007.0 KiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1            2048            4095   1024.0 KiB  EF02  BIOS boot partition
   2            4096          106495   50.0 MiB    EF00  EFI System
   3          106496         7897053   3.7 GiB     8300  Linux filesystem

Command (? for help): x

Expert command (? for help): z
About to wipe out GPT on /dev/sdb. Proceed? (Y/N): y
GPT data structures destroyed! You may now partition the disk using fdisk or
other utilities.
Blank out MBR? (Y/N): y

坏的分区表立即返回：

root@demo [~]# gdisk /dev/sdb
GPT fdisk (gdisk) version 1.0.3

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

Warning! Main and backup partition tables differ! Use the 'c' and 'e' options
on the recovery & transformation menu to examine the two tables.

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

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

Found valid MBR and corrupt GPT. Which do you want to use? (Using the
GPT MAY permit recovery of GPT data.)
 1 - MBR
 2 - GPT
 3 - Create blank GPT

Your answer:

使用擦除磁盘的开头dd没有任何效果，或者：

root@demo [~]# hexdump -C /dev/sdb | head
00000000  eb 63 90 00 00 00 00 00  00 00 00 00 00 00 00 00  |.c..............|
00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000050  00 00 00 00 00 00 00 00  00 00 00 80 00 08 00 00  |................|
00000060  00 00 00 00 ff fa 90 90  f6 c2 80 74 05 f6 c2 70  |...........t...p|
00000070  74 02 b2 80 ea 79 7c 00  00 31 c0 8e d8 8e d0 bc  |t....y|..1......|
00000080  00 20 fb a0 64 7c 3c ff  74 02 88 c2 52 bb 17 04  |. ..d|<.t...R...|
00000090  f6 07 03 74 06 be 88 7d  e8 17 01 be 05 7c b4 41  |...t...}.....|.A|
000000a0  bb aa 55 cd 13 5a 52 72  3d 81 fb 55 aa 75 37 83  |..U..ZRr=..U.u7.|
000000b0  e1 01 74 32 31 c0 89 44  04 40 88 44 ff 89 44 02  |[email protected].|
root@demo [~]# dd if=/dev/zero of=/dev/sdb bs=1M count=1 status=progress
1+0 records in
1+0 records out
1048576 bytes (1.0 MB, 1.0 MiB) copied, 0.0219383 s, 47.8 MB/s
root@demo [~]# hexdump -C /dev/sdb | head
00000000  eb 63 90 00 00 00 00 00  00 00 00 00 00 00 00 00  |.c..............|
00000010  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00000050  00 00 00 00 00 00 00 00  00 00 00 80 00 08 00 00  |................|
00000060  00 00 00 00 ff fa 90 90  f6 c2 80 74 05 f6 c2 70  |...........t...p|
00000070  74 02 b2 80 ea 79 7c 00  00 31 c0 8e d8 8e d0 bc  |t....y|..1......|
00000080  00 20 fb a0 64 7c 3c ff  74 02 88 c2 52 bb 17 04  |. ..d|<.t...R...|
00000090  f6 07 03 74 06 be 88 7d  e8 17 01 be 05 7c b4 41  |...t...}.....|.A|
000000a0  bb aa 55 cd 13 5a 52 72  3d 81 fb 55 aa 75 37 83  |..U..ZRr=..U.u7.|
000000b0  e1 01 74 32 31 c0 89 44  04 40 88 44 ff 89 44 02  |[email protected].|

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