从 PartedMagic 更改 HFSPlus UUID

Question 1

首先我将创建一个500M的图像文件：

$ cd /tmp
$ fallocate -l $((1024*1024*500)) ./disk

现在我给它一个 GPT：

$ gdisk ./disk

GPT fdisk (gdisk) version 0.8.10

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

Creating new GPT entries.

o用于创建新的 GPT。

Command (? for help): o
This option deletes all partitions and creates a new protective MBR.
Proceed? (Y/N): y

n用于创建新分区。之后我只需按 Enter 键即可选择所有默认值。

Command (? for help): n
Partition number (1-128, default 1): 1
First sector (34-1023966, default = 2048) or {+-}size{KMGTP}: 
Last sector (2048-1023966, default = 1023966) or {+-}size{KMGTP}: 
Current type is 'Linux filesystem'
Hex code or GUID (L to show codes, Enter = 8300): 
Changed type of partition to 'Linux filesystem'

w将更改写入磁盘。

Command (? for help): w

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!

Do you want to proceed? (Y/N): y
OK; writing new GUID partition table (GPT) to ./disk.
Warning: The kernel is still using the old partition table.
The new table will be used at the next reboot.
The operation has completed successfully.

现在我将其设置为分区块设备并使用文件系统格式化第一个分区：

$ sync; lp=$(sudo losetup --show -fP ./disk)
$ sudo mkfs.vfat -n SOMEDISK "${lp}p1"

结果：

$ lsblk -o NAME,FSTYPE,LABEL,PARTUUID "$lp"

NAME      FSTYPE LABEL    PARTUUID       
loop0                                
└─loop0p1 vfat   SOMEDISK f509e1d4-32bc-4a7d-9d47-b8ed0f280b36

现在，要改变这一点。首先，销毁块开发：

$ sudo losetup -d "$lp"

现在，编辑 GPT：

$ gdisk ./disk

GPT fdisk (gdisk) version 0.8.10
Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present
Found valid GPT with protective MBR; using GPT.

i提供有关单个分区的扩展信息。如果我有多个分区，接下来会提示我输入其分区号。后面的命令也是如此c。

Command (? for help): i
Using 1
Partition GUID code: 0FC63DAF-8483-4772-8E79-3D69D8477DE4 (Linux filesystem)
Partition unique GUID: F509E1D4-32BC-4A7D-9D47-B8ED0F280B36
First sector: 2048 (at 1024.0 KiB)
Last sector: 1023966 (at 500.0 MiB)
Partition size: 1021919 sectors (499.0 MiB)
Attribute flags: 0000000000000000
Partition name: 'Linux filesystem'

x是xperts 菜单。

Command (? for help): x

c用于更改 PARTUUID。

Expert command (? for help): c
Using 1
Enter the partition's new unique GUID ('R' to randomize): F509E1D4-32BC-4A7D-9D47-B00B135D15C5                  
New GUID is F509E1D4-32BC-4A7D-9D47-B00B135D15C5

w将更改写入磁盘（或者，在本例中，到我的图像文件）。

Expert command (? for help): w

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!

Do you want to proceed? (Y/N): y
OK; writing new GUID partition table (GPT) to ./disk.
Warning: The kernel is still using the old partition table.
The new table will be used at the next reboot.
The operation has completed successfully.

$ sync; lp=$(sudo losetup --show -fP ./disk)

结果：

$ lsblk -o NAME,FSTYPE,LABEL,PARTUUID "$lp"

NAME      FSTYPE LABEL    PARTUUID
loop0                     
└─loop0p1 vfat   SOMEDISK f509e1d4-32bc-4a7d-9d47-b00b135d15c5

Answer