Each drive is labeled with an identifier such as "disk0", "disk1", etc.
In the screenshot below, my USB drive (which is named "PIZZA") has the identifier "disk4". Next, type the following commands: diskutil unmountdisk /dev/"identifier" sudo dd if="location of Niresh disk image" of=/dev/r"identifier" bs=1m Replace "identifier" with the actual identifier of your USB drive (don't include the quotation marks), and replace "location of Niresh disk image" with the actual file path of the Niresh disk image that you downloaded (also without quotation marks).
NOTE: If you're installing Mac OS X on a computer that already has Windows installed on a separate internal hard drive, you may have to enable AHCI for Windows beforehand. Also, after installing Mac OS X, you should also sync your clock on Windows with Mac OS X.
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You can seriously damage your Mac's software integrity if you use these tools indiscriminately.
Of all the least harmless tools you can use are those which manage your logfile cleanup which happens on a daily, weekly, and monthly basis when your machine is left on overnight.