dd 减少了 ssd 的大小

dd 减少了 ssd 的大小

我的 32 Gb ssd 被划分为 8 Gb 和 29 Gb。我使用 dd 将 ubuntu iso 写入我的 pendrive,但不小心将其写入了我的 ssd 的 8 gb 分区。现在 gparted 没有显示那个 8 Gb 分区。我该如何恢复它??命令是dd if=path_to_iso of=/dev/sdbsdb 是 ssd 输出sudo fdisk -l是:

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


Disk /dev/sda: 500.1 GB, 500107862016 bytes  
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors  
Units = sectors of 1 * 512 = 512 bytes  
Sector size (logical/physical): 512 bytes / 4096 bytes  
I/O size (minimum/optimal): 4096 bytes / 4096 bytes  
Disk identifier: 0xb367fbf3  

  ` Device Boot      Start         End      Blocks   Id  System  
/dev/sda1               1   976773167   488386583+  ee  GPT  
Partition 1 does not start on physical sector boundary.  `

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


Disk /dev/sdb: 32.0 GB, 32017047552 bytes  
255 heads, 63 sectors/track, 3892 cylinders, total 62533296 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  
Disk identifier: 0x01a1f343  

  ` Device Boot      Start         End      Blocks   Id  System  `

并且输出为df -h

Filesystem      Size  Used Avail Use% Mounted on  
/dev/sda7       303G  8.3G  280G   3% /  
none            4.0K     0  4.0K   0% /sys/fs/cgroup  
udev            2.9G  4.0K  2.9G   1% /dev  
tmpfs           594M  1.2M  593M   1% /run  
none            5.0M     0  5.0M   0% /run/lock  
none            2.9G  288K  2.9G   1% /run/shm  
none            100M   44K  100M   1% /run/user  

的输出sudo parted -l是:

Model: ATA ST500LT012-9WS14 (scsi)  
Disk /dev/sda: 500GB  
Sector size (logical/physical): 512B/4096B  
Partition Table: gpt  

Number  Start   End     Size    File system     Name                          Flags  
 1      1049kB  525MB   524MB   fat32           EFI system partition          boot  
 2      525MB   567MB   41.9MB  fat32           Basic data partition          hidden  
 3      567MB   701MB   134MB                   Microsoft reserved partition  msftres  
 4      701MB   1215MB  514MB   ntfs            Basic data partition          hidden, diag  
 5      1215MB  153GB   152GB   ntfs            Basic data partition          msftdata  
 7      153GB   484GB   331GB   ext4  
 8      484GB   489GB   5243MB  linux-swap(v1)  
 6      489GB   500GB   11.0GB  ntfs            Microsoft recovery partition  hidden, diag  


Model: ATA LITEONIT LMS-32L (scsi)  
Disk /dev/sdb: 32.0GB  
Sector size (logical/physical): 512B/512B  
Partition Table: msdos  

Number  Start  End  Size  Type  File system  Flags  

我无意中忘记放 sdb1

sudo parted /dev/sdb print free得到:

Model: ATA LITEONIT LMS-32L (scsi)  
Disk /dev/sdb: 32.0GB  
Sector size (logical/physical): 512B/512B  
Partition Table: msdos  

Number  Start   End     Size    Type  File system  Flags  
        32.3kB  32.0GB  32.0GB        Free Space  

gparted 显示 29 gb 未分配

答案1

好的,你的dd命令已经覆盖了你的分区表。当你指定一个没有数字的 dev 名称(例如/dev/sdb)时,它指的是全部的磁盘,而不是特定分区。因此,当您运行 时dd if=path_to_iso of=/dev/sdb,您会将映像直接复制到磁盘并破坏 GPT 头文件。

通缉运行是:

dd if=path_to_iso of=/dev/sdb2

您可能能够从中恢复,但不能保证。如果您幸运的话,您将存储一个备份 GPT 表。如果是这样,gdisk也许可以拯救您。尝试

 gdisk /dev/sdb 

你应该看到类似这样的行

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.
****************************************************************************

细节会有所不同,但应该会出现类似的消息。如果你幸运的话,gdisk会自动修复所有问题。如果没有,请参阅这里了解更多信息。

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