The design of read head structure incorporating multiple readers is advantageous for inter-track interference cancellation in Two-Dimensional Magnetic Recording (TDMR) [1,2]. It is therefore seen as a promising technology to achieve extremely high recording density. However, it is found that there is additional noise in the read sensor due to the magnetic field emanated from the recorded tracks on the medium [3]. The influence of the recorded magnetic patterns on the medium manifests itself also through the high frequency noises caused primarily by the thermal fluctuations. Previous study shows that with the downsizing of the read sensor to accommodate increased recording density demands, the thermal magnetic noises become the key limiting factor in the applicability of the magnetoresistive sensors [4-5]. In this paper, we present an investigation of the effects of thermal magnetic noises in the readers under off-track reading conditions.