Method 1: Using Disk Utility
Disk Utility is a built-in application on Mac that can format, partition, and restore disks and disk images. You can use it to create a bootable USB drive with Snow Leopard installer from a DVD or an ISO file. Here are the steps:
Insert the Snow Leopard DVD into your Mac's optical drive, or mount the ISO file by double-clicking on it.
Launch Disk Utility from the Applications folder or by using Spotlight.
Locate the USB drive on the left-hand side of the Disk Utility window and click on its name, not its partition.
Click on the Partition tab and select 1 Partition from the Partition Layout drop-down menu.
Click on the Format drop-down menu and select Mac OS Extended (Journaled) as the format. You can also rename the USB drive if you want.
Click on the Apply button to erase and format the USB drive. This will delete all data on the drive, so make sure you have backed up any important files before proceeding.
Select the name of the USB drive and click on the Restore button on the top of the Disk Utility window.
In the pop-up window, select Restore from Mac OS X Install DVD (or the name of the mounted ISO file) and drag and drop it into the Source field.
Drag and drop the USB drive's partition into the Destination field.
Click on the Restore button in the pop-up window to start copying the installer files to the USB drive. This may take some time depending on your Mac's speed.
When the process is complete, you can eject the USB drive and use it to boot and install Snow Leopard on your Mac.
Method 2: Using Terminal
Terminal is another built-in application on Mac that allows you to execute commands using a text-based interface. You can use it to create a bootable USB drive with Snow Leopard installer from an ISO file using a command called dd. Here are the steps:
Mount the ISO file by double-clicking on it.
Launch Terminal from the Applications folder or by using Spotlight.
Type diskutil list and press Enter to see a list of all disks and partitions connected to your Mac. Note down the identifier of your USB drive (e.g., disk2) and the identifier of the mounted ISO file (e.g., disk3s1).
Type diskutil unmountDisk /dev/diskX (replace X with your USB drive's identifier) and press Enter to unmount the USB drive.
Type sudo dd if=/dev/diskYsZ of=/dev/diskX bs=1m (replace X with your USB drive's identifier, Y with your ISO file's disk number, and Z with your ISO file's partition number) and press Enter to copy the installer files to the USB drive. You may need to enter your administrator password for this command. This may take some time depending on your Mac's speed.
Type diskutil eject /dev/diskX (replace X with your USB drive's identifier) and press Enter to eject the USB drive.
You can now use the USB drive to boot and install Snow Leopard on your Mac.
We hope this article helped you create a bootable USB drive with Snow Leopard installer. For more information on how to use the USB drive to boot and install Snow Leopard, you can refer to [this article].
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