Linux dd命令基于ISO文件制作U盘启动盘
linux下的dd命令来自于coreutils：http://www.gnu.org/software/coreutils/
https://jingyan.baidu.com/article/d45ad148e203f969552b800a.html
在win10的Bash on Ubuntu on Windows下也支持dd命令，但是不支持/dev/sdb
dd if=/mnt/d/OS/CentOS-7-x86_64-DVD-1503-01.iso of=/mnt/e bs=2M
bs=2M block speed，块速度，如果超过2M/s(econds)，【可能】文件会损坏，丢数。
https://stackoverflow.com/questions/38954691/is-usb-supported-on-bash-on-ubuntu-on-windows-10
https://wpdev.uservoice.com/forums/266908-command-prompt-console-bash-on-ubuntu-on-windo/suggestions/13396686-access-to-real-linux-devices-in-dev
查看U盘对应的dev符号：
Administrator@Andy-PC MINGW64 /d/Download $ ll /dev total 4 crw-rw-rw- 1 Administrator 197121 13, 254 12月 1 2006 clipboard crw-rw-rw- 1 Administrator 197121 5, 255 3月 10 14:46 conin crw-rw-rw- 1 Administrator 197121 5, 254 3月 10 14:46 conout crw-rw-rw- 1 Administrator 197121 5, 1 3月 10 14:46 console crw-rw-rw- 1 Administrator 197121 14, 3 3月 10 14:46 dsp lrwxrwxrwx 1 Administrator 197121 13 4月 14 2018 fd -> /proc/self/fd/ crw-rw-rw- 1 Administrator 197121 1, 7 3月 10 14:46 full crw------- 1 Administrator 197121 1, 11 3月 10 14:46 kmsg drwxr-xr-x 1 Administrator 197121 0 4月 14 2018 mqueue/ crw-rw-rw- 1 Administrator 197121 1, 3 3月 10 14:46 null crw-rw-rw- 1 Administrator 197121 5, 2 3月 10 14:46 ptmx crw------- 1 Administrator 197121 136, 0 3月 10 14:46 pty0 crw-rw-rw- 1 Administrator 197121 1, 8 3月 10 14:46 random brw-rw-rw- 2 Administrator 197121 11, 0 3月 10 14:46 scd0 brw-rw-rw- 1 Administrator 197121 8, 0 3月 10 14:46 sda brw-rw-rw- 1 Administrator 197121 8, 1 3月 10 14:46 sda1 brw-rw-rw- 1 Administrator 197121 8, 2 3月 10 14:46 sda2 brw-rw-rw- 1 Administrator 197121 8, 3 3月 10 14:46 sda3 brw-rw-rw- 1 Administrator 197121 8, 4 3月 10 14:46 sda4 brw-rw-rw- 1 Administrator 197121 8, 5 3月 10 14:46 sda5 brw-rw-rw- 1 Administrator 197121 8, 6 3月 10 14:46 sda6 brw-rw-rw- 1 Administrator 197121 8, 7 3月 10 14:46 sda7 drwxr-xr-x 1 Administrator 197121 0 4月 14 2018 shm/ brw-rw-rw- 2 Administrator 197121 11, 0 3月 10 14:46 sr0 lrwxrwxrwx 1 Administrator 197121 15 4月 14 2018 stderr -> /proc/self/fd/2 lrwxrwxrwx 1 Administrator 197121 15 4月 14 2018 stdin -> /proc/self/fd/0 lrwxrwxrwx 1 Administrator 197121 15 4月 14 2018 stdout -> /proc/self/fd/1 crw-rw-rw- 1 Administrator 197121 5, 0 3月 10 14:46 tty crw-rw-rw- 1 Administrator 197121 1, 9 3月 10 14:46 urandom crw-rw-rw- 1 Administrator 197121 13, 255 3月 10 14:46 windows crw-rw-rw- 1 Administrator 197121 1, 5 3月 10 14:46 zero Administrator@Andy-PC MINGW64 /d/Download $ ll /dev total 4 crw-rw-rw- 1 Administrator 197121 13, 254 12月 1 2006 clipboard crw-rw-rw- 1 Administrator 197121 5, 255 3月 10 14:47 conin crw-rw-rw- 1 Administrator 197121 5, 254 3月 10 14:47 conout crw-rw-rw- 1 Administrator 197121 5, 1 3月 10 14:47 console crw-rw-rw- 1 Administrator 197121 14, 3 3月 10 14:47 dsp lrwxrwxrwx 1 Administrator 197121 13 4月 14 2018 fd -> /proc/self/fd/ crw-rw-rw- 1 Administrator 197121 1, 7 3月 10 14:47 full crw------- 1 Administrator 197121 1, 11 3月 10 14:47 kmsg drwxr-xr-x 1 Administrator 197121 0 4月 14 2018 mqueue/ crw-rw-rw- 1 Administrator 197121 1, 3 3月 10 14:47 null crw-rw-rw- 1 Administrator 197121 5, 2 3月 10 14:47 ptmx crw------- 1 Administrator 197121 136, 0 3月 10 14:47 pty0 crw-rw-rw- 1 Administrator 197121 1, 8 3月 10 14:47 random brw-rw-rw- 2 Administrator 197121 11, 0 3月 10 14:47 scd0 brw-rw-rw- 1 Administrator 197121 8, 0 3月 10 14:47 sda brw-rw-rw- 1 Administrator 197121 8, 1 3月 10 14:47 sda1 brw-rw-rw- 1 Administrator 197121 8, 2 3月 10 14:47 sda2 brw-rw-rw- 1 Administrator 197121 8, 3 3月 10 14:47 sda3 brw-rw-rw- 1 Administrator 197121 8, 4 3月 10 14:47 sda4 brw-rw-rw- 1 Administrator 197121 8, 5 3月 10 14:47 sda5 brw-rw-rw- 1 Administrator 197121 8, 6 3月 10 14:47 sda6 brw-rw-rw- 1 Administrator 197121 8, 7 3月 10 14:47 sda7 brw-rw-rw- 1 Administrator 197121 8, 16 3月 10 14:47 sdb brw-rw-rw- 1 Administrator 197121 8, 17 3月 10 14:47 sdb1 drwxr-xr-x 1 Administrator 197121 0 4月 14 2018 shm/ brw-rw-rw- 2 Administrator 197121 11, 0 3月 10 14:47 sr0 lrwxrwxrwx 1 Administrator 197121 15 4月 14 2018 stderr -> /proc/self/fd/2 lrwxrwxrwx 1 Administrator 197121 15 4月 14 2018 stdin -> /proc/self/fd/0 lrwxrwxrwx 1 Administrator 197121 15 4月 14 2018 stdout -> /proc/self/fd/1 crw-rw-rw- 1 Administrator 197121 5, 0 3月 10 14:47 tty crw-rw-rw- 1 Administrator 197121 1, 9 3月 10 14:47 urandom crw-rw-rw- 1 Administrator 197121 13, 255 3月 10 14:47 windows crw-rw-rw- 1 Administrator 197121 1, 5 3月 10 14:47 zero
插上u盘后，多了一个sdb（sd-b，即第二个设备；再插一个u盘，则出现sdc，sd-c）
sd，system device。
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Administrator@Andy-PC MINGW64 /d/Download $ dd if=openEuler-22.09-everything-debug-x86_64-dvd.iso of=/dev/sdc bs=4M status=progress
$ dd if=ubuntu-23.04-desktop-amd64.iso of=/dev/sdb bs=4M status=progress
4928307200 bytes (4.9 GB, 4.6 GiB) copied, 692.388 s, 7.1 MB/s
1175+1 records in
1175+1 records out
4932407296 bytes (4.9 GB, 4.6 GiB) copied, 692.961 s, 7.1 MB/s
$ dd if=ubuntu-22.10-desktop-amd64.iso of=/dev/sdb bs=8M status=progress
dd: error writing '/dev/sdb': Invalid request code
1+0 records in
0+0 records out
4294967295 bytes (4.3 GB, 4.0 GiB) copied, 0.0152522 s, 282 GB/s
Administrator@Andy-PC MINGW64 /d/ISO
$ dd if=ubuntu-22.10-desktop-amd64.iso of=/dev/sdb bs=4M status=progress
4071903232 bytes (4.1 GB, 3.8 GiB) copied, 586.356 s, 6.9 MB/s
970+1 records in
970+1 records out
4071903232 bytes (4.1 GB, 3.8 GiB) copied, 586.361 s, 6.9 MB/s
Administrator@Andy-PC MINGW64 /d/ISO
$ dd if=debian-12.2.0-amd64-DVD-1.iso of=/dev/sdb bs=4M status=progress
3988783104 bytes (4.0 GB, 3.7 GiB) copied, 653.052 s, 6.1 MB/s
952+1 records in
952+1 records out
3994091520 bytes (4.0 GB, 3.7 GiB) copied, 653.991 s, 6.1 MB/s
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