High signal output and low noise is what is desired in hard drive read operations, thus, researchers try to achieve a high signal-to-noise (S/N) ratio in developing effective read-head technology.

• 硬盘驱动器的持续的推进要求能力越来越紧压和因而，越来越小数据位元录音媒介，需要录音磁头的持续的小型化读那些位。