垂直 すいちょく磁気 じき記録 きろくじゃなかったです
suichokujikikirokujanakattadesu

Noun
Desu Copula

The polite, past negative form of 垂直磁気記録

1. Wasn't perpendicular magnetic recording.

Past/Perfective
Negative
Polite
Casual Register
Computing