ubuntu install u盘制作
make iso u disk
diskutil list
Lists out all disk drives and their volumes. Drives are labeled as disk0, disk1, disk2, etc. Volumes are labeled disk1s0, disk1s1, disk1s2, etc. For our purposes, we only care about the drive. In this case, we’re going to assume our flash drive is disk2.
diskutil unmountDisk disk2
The unmountDisk command unmounts all volumes of the given disk drive but keeps the drive itself visible to the computer (as opposed to the eject option that disconnects it entirely)
sudo dd if=/Users/kyle/Downloads/Linux.iso of=/dev/disk2 bs=8m
“sudo” tells the system to use root level (that is the system’s highest level) privileges to perform the following action.
“dd” is an extremely basic, but powerful block level copy command built into all Linux and Unix operating systems (MacOS is UNIX based)
“if” stands for input file (a.k.a the source file or location). In our use-case, this is the .ISO file. In MacOS, if you have a finder window open, you can drag and drop the .iso into the terminal and it will auto-fill this file path.
“of” stands for “output file” (a.k.a the destination file or location). For us, this is our USB drive, disk2. The specific path for external drives is in “/dev”, hence /dev/disk2
“bs” stands for block size. dd copies data in blocks rather than on a file by file basis (this is why it’s so fast) and this command gives you the option to set how big each block is. There is a science to the ideal block size, but I don’t know it. 8m (MegaBytes) has consistently worked well for my uses.
The command will not show any progress until it’s done, but you can press control+t for status updates. With an average computer, this takes less than 5min to complete.
Once complete:
diskutil eject disk2
The USB drive can now safely be removed. Assuming that the iso is EFI-compatible, you can reboot your mac to test it.
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http://osxdaily.com/2015/06/05/copy-iso-to-usb-drive-mac-os-x-command/
- Unmount the target volume using the following command, replacing the identifier as appropriate:
sudo umount /dev/(IDENTIFIER)
Again using the above example, which is not universally applicable:
sudo umount /dev/disk3s2
- You’re now ready to format the target drive and ‘burn’ the ISO to that USB volume – this will erase all data on the target drive replacing it with the ISO, this can not be undone – it is absolutely critical that you target the proper identifier to avoid unintended data loss. Assuming you know what you’re doing, replace the iso path with the ISO to burn to the intended target identifier volume using the following command:
sudo dd if=/path/image.iso of=/dev/r(IDENTIFIER) bs=1m
For example, with a Windows ISO named ‘Windows10_x64_EN-US.iso’ on the desktop, the syntax would be:
sudo dd if=~/Desktop/Windows10_x64_EN-US.iso of=/dev/rdisk3s2 bs=1m
Note that an ‘r’ signifier is placed in front of the disk identifier, this makes the command much faster. The ‘bs=1m’ at the end is for blocksize, which also speeds up the process. Neither of these adjustments are necessary to copy the ISO to the disk image successfully, it just results in a notably faster experience.
- When you’re certain the syntax is proper, hit return and enter the administrator password, the copy process will begin immediately
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