If using dd for Windows, run dd -list and look carefully at the list of NT Block Device Objects and use the one that looks like \?\Device\Harddisk1\Partition0 where the description is something like Removable media other than floppy. If using a version of Windows newer than 7, make sure you unmount the USB drive first (formatting it prior to launching the disk copier is one way to accomplish that), otherwise Windows might refuse to write on the stick, bailing out with the "can't write to drive" error message. Confirmed as functioning correctly are Rufus (may depend on options selected, there have been reports of failure with rufus too), Fedora LiveUSB Creator, Win32 Disk Imager, Rawrite32 and dd for Windows.
Applications known (so far) to NOT work are unetbootin, multibootusb and "universal usb installler" - do NOT use these.
Moreover, the CentOS 7 installer image has a special partitioning which, as of July 2014, most Windows tools do NOT transfer correctly leading to undefined behaviour when booting from the USB key.
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