我从 Ubuntu USB 驱动器启动笔记本电脑。我想使用 dd 来镜像笔记本电脑，这样我就可以在格式化之前获得一份副本。当我这样做时，fdisk -l我得到了
root@ubuntu:/mnt/nfs/volume2/drive2/fpp/test# fdisk -l /dev/sda
Disk /dev/sda: 29.9 GiB, 32080200192 bytes, 62656641 sectors
Disk model: Flash Drive
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x20ac7dda
Device Boot Start End Sectors Size Id Type
/dev/sda1 3224498923 3657370039 432871117 206.4G 7 HPFS/NTFS/exFAT
/dev/sda2 3272020941 5225480974 1953460034 931.5G 16 Hidden FAT16
/dev/sda3 0 0 0 0B 6f unknown
/dev/sda4 50200576 974536369 924335794 440.8G 0 Empty
Partition table entries are not in disk order.
root@ubuntu:/mnt/nfs/volume2/drive2/fpp/test#
看起来第一个列表是我的 USB 拇指驱动器，第二个列表是笔记本电脑的实际驱动器。笔记本电脑的磁盘和 USB 驱动器不应该有不同的驱动器号吗？
编辑：以下是输出fdisk -l
root@ubuntu:/mnt/nfs/volume2/drive2/fpp/test# fdisk -l
Disk /dev/loop0: 1.99 GiB, 2109763584 bytes, 4120632 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 /dev/loop1: 218.102 MiB, 229629952 bytes, 448496 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 /dev/loop2: 55.48 MiB, 58159104 bytes, 113592 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 /dev/loop3: 64.79 MiB, 67915776 bytes, 132648 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 /dev/loop4: 51.4 MiB, 53522432 bytes, 104536 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 /dev/loop5: 31.9 MiB, 32595968 bytes, 63664 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 /dev/sda: 29.9 GiB, 32080200192 bytes, 62656641 sectors
Disk model: Flash Drive
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x20ac7dda
Device Boot Start End Sectors Size Id Type
/dev/sda1 3224498923 3657370039 432871117 206.4G 7 HPFS/NTFS/exFAT
/dev/sda2 3272020941 5225480974 1953460034 931.5G 16 Hidden FAT16
/dev/sda3 0 0 0 0B 6f unknown
/dev/sda4 50200576 974536369 924335794 440.8G 0 Empty
Partition table entries are not in disk order.
root@ubuntu:/mnt/nfs/volume2/drive2/fpp/test#