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The performance of two types of trailing shield perpendicular writers with either double coil or single coil are investigated. It has been found that signal-to-noise ratio (SNR) performance of different designs strongly depends on the tradeoff of field gradient and writability. Reverse DC noise analysis is used to understand the recording properties of head and media quantitatively. To realize the performance advantages of the single coil design and to suppress the trailing shield erasure, a novel single coil structure with double write gap is proposed.