mac下制作USB启动盘

 

 

 

From Mac

 

Note: this procedure requires an .img file that you will be required to create from the .iso file you download. 

 

TIP: Drag and Drop a file from Finder to Terminal to "paste" the full path without typing and risking type errors. 

Download the desired file 

Open the Terminal (in /Applications/Utilities/ or query Terminal in Spotlight) 

 

Convert the .iso file to .img using the convert option of hdiutil (e.g., hdiutil convert -format UDRW -o ~/path/to/target.img ~/path/to/kubuntu.iso) Note: OS X tends to put the .dmg ending on the output file automatically. 

 

Run diskutil list to get the current list of devices 

Insert your flash media 

 

Run diskutil list again and determine the device node assigned to your flash media (e.g. /dev/disk2) 

 

Run diskutil unmountDisk /dev/diskN (replace N with the disk number from the last command; in the previous example, N would be 2) 

 

Execute sudo dd if=/path/to/downloaded.img of=/dev/rdiskN bs=1m (replace /path/to/downloaded.img with the path where the image file is located; for example, ./ubuntu.img or ./ubuntu.dmg). Using /dev/rdisk instead of /dev/disk may be faster. If you see the error dd: Invalid number `1m', you are using GNU dd. Use the same command but replace bs=1m with bs=1M. If you see the error  dd: /dev/diskN: Resource busy  make sure the disk is not in use. Start the "Disk Utility.app" and unmount (not eject) the drive. 

 

Run diskutil eject /dev/diskN and remove your flash media when the command completes 

 

Restart you Mac and press alt while the Mac is restarting to choose the USB-Stick

 

 

 

快速几步：

 

1.把iso转成dmg格式

 

hdiutil convert -format UDRW -o ~/path/to/target.img ~/path/to/kubuntu.iso

 

2. 查找USB有设备盘符

 

diskutil list

 

3. 把USB unmount

 

diskutil unmountDisk /dev/diskN

N是查找到u盘 可能是1，2这样的数字

 

 

4. 把dmg复制到u盘

 

sudo dd if=/path/to/downloaded.img of=/dev/rdiskN bs=1m

 

If you see the error dd: Invalid number `1m', you are using GNU dd. Use the same command but replace bs=1m with bs=1M. If you see the error  dd: /dev/diskN: Resource busy  make sure the disk is not in use. Start the "Disk Utility.app" and unmount (not eject) the drive. 

 

5. 弹出U盘

 

diskutil eject /dev/diskN

 

 

6. 重启时按住Option键，选择usb启动。