谁能帮我解决这个问题？
有时当我dd向 USB 棒执行命令时，它很快就完成了，而实际上并没有将数据写入 USB。我发现/dev/sdb在这种情况下，它实际上是在写入文件而不是设备，而fdisk输出仅指向/dev/sdb。
root@localhost:/sys/bus/pci/drivers/xhci_hcd# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 119.2G 0 disk
|-sda1 8:1 0 189.8M 0 part /boot/efi
|-sda2 8:2 0 976.6M 0 part /boot
|-sda3 8:3 0 1.9M 0 part /app_disk
|-sda4 8:4 0 1.4G 0 part /
|-sda5 8:5 0 5.7G 0 part /var
|-sda6 8:6 0 104.2G 0 part
| |-vg0_vjunos-lv_junos 252:0 0 10G 0 lvm /junos
| `-vg0_vjunos-lv_var_third_party 252:1 0 94.2G 0 lvm /third-party
`-sda7 8:7 0 1.2G 0 part [SWAP]
sdb 8:16 1 7.2G 0 disk
`-sdb1 8:17 1 1.8G 0 part
root@localhost:/sys/bus/pci/drivers/xhci_hcd# sudo dd if=/var/third-party/install-media-host-usb-nfx-3-20170106_0834_sushilkd.img of=/dev/sdb bs=1M
1799+0 records in
1799+0 records out
1886388224 bytes (1.9 GB) copied, 1.04298 s, 1.8 GB/s
root@localhost:/sys/bus/pci/drivers/xhci_hcd# sudo dd if=/var/third-party/install-media-host-usb-nfx-3-20170106_0834_sushilkd.img of=/dev/sdb bs=1M ^C
root@localhost:/sys/bus/pci/drivers/xhci_hcd# sudo dd if=/var/third-party/install-media-host-usb-nfx-3-20170106_0834_sushilkd.img of=/dev/sdb conv=fsync
3684352+0 records in
3684352+0 records out
1886388224 bytes (1.9 GB) copied, 4.25185 s, 444 MB/s
root@localhost:/sys/bus/pci/drivers/xhci_hcd# fdisk -l
Disk /dev/sda: 119.2 GiB, 128035676160 bytes, 250069680 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
Disklabel type: gpt
Disk identifier: E38875B6-7CE2-4115-A28B-87BE8974DDF2
Device Start End Size Type
/dev/sda1 1953 390625 189.8M EFI System
/dev/sda2 390626 2390625 976.6M Microsoft basic data
/dev/sda3 2390626 2394531 1.9M Microsoft basic data
/dev/sda4 2394532 5394531 1.4G Microsoft basic data
/dev/sda5 5394532 17394531 5.7G Microsoft basic data
/dev/sda6 17394532 235984375 104.2G Microsoft basic data
/dev/sda7 235984376 238484375 1.2G Microsoft basic data
Disk /dev/mapper/<XXXX>: 10 GiB, 10737418240 bytes, 20971520 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/mapper/<XXXX>: 94.2 GiB, 101179195392 bytes, 197615616 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/sdb: 1.8 GiB, 1886388224 bytes, 3684352 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
Disklabel type: dos
Disk identifier: 0xd87c498e
Device Boot Start End Blocks Id System
/dev/sdb1 * 2048 3684351 1841152 e W95 FAT16 (LBA)
答案1
我已经遇到了这个问题，我这样做了（无需重启）：在同步命令之后，移除你的 USB 记忆棒，删除设备文件，在本例中为 sudo rm /dev/sdb 。重新插入你的 USB 记忆棒后，你就可以再次写入了。