垂直写入技术（英语：Perpendicular recording，PMR），是一种硬盘访问技术。

由于现今硬盘的数据记录区块大小已经发展到宽度只有30奈米左右，而磁性记录颗粒的尺寸不断下降，但硬盘容量倍数上升，导致出现电磁学上的超顺磁效应（超顺磁性），大大降低了硬盘的容量提升潜力。因此为了配合电脑技术发展有公司开始发展运用垂直写入技术的硬盘。

Perpendicular recording (or Perpendicular Magnetic Recording, PMR) is a technology for data recording on hard disks. It was first proven advantageous in 1976 by Shun-ichi Iwasaki, then professor of the Tohoku University in Japan, and first commercially implemented in 2005. The first industry-standard demonstration showing unprecedented advantage of PMR over longitudinal magnetic recording (LMR) at nanoscale dimensions was made in 1998 at IBM Almaden Research Center in collaboration with researchers of Data Storage Systems Center (DSSC) – a National Science Foundation (NSF) Engineering Research Center (ERCs) at Carnegie Mellon University (CMU).