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:param block_device: str: Full path of block device to clean.
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check_call(['sgdisk', '--zap-all', '--clear',
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call(['sgdisk', '--zap-all', '--mbrtogpt',
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check_call(['dd', 'if=/dev/zero', 'of=%s'%(block_device),
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check_call(['dd', 'if=/dev/zero', 'of=%s'%(block_device),