水平 すいへい磁気 じき記録 きろくじゃなかったです
suiheijikikirokujanakattadesu

Noun
Desu Copula

The polite, past negative form of 水平磁気記録

1. Wasn't perpendicular magnetic recording.; Wasn't level magnetic recording.

Past/Perfective
Negative
Polite
Casual Register
Computing