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Does dd or Windows Image Writer work regardless whether the target device was formatted or partitioned correctly?

I'm trying to flash a Chromium OS build to a USB flash drive following these instructions.

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up vote 3 down vote accepted

Yes (you don't need to partition the drive). When you write directly to a block device (/dev/sdX) with dd, you are overwriting any partition table currently on the drive.

I haven't ever used (or heard of) Windows Image Writer, but if it's similar to dd, it writes raw data to the drive, regardless of what was present before.

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