noun
magnetic strip malfunction
Technical term used for credit cards, transit cards, and other cards with magnetic stripes when the stripe cannot be read properly.
磁気不良でカードが使えなかった。
I couldn't use the card because of a magnetic strip malfunction.
このカードは磁気不良のため、再発行が必要です。
This card needs to be reissued due to a magnetic strip malfunction.
Compound of 磁気 (magnetic) and 不良 (defect, malfunction).