noun
read-write slot; read-write opening
Computing term for a physical slot or opening on a device that accepts both reading and writing of data, such as a memory card slot.
この端末には読取り書込み開口部が二つある。
This terminal has two read-write slots.
読取り書込み開口部にカードを挿入してください。
Please insert the card into the read-write opening.
Compound of 読取り (yomitori, 'reading') + 書込み (kakikomi, 'writing') + 開口部 (kaikōbu, 'opening, aperture'). A technical term formed from native Japanese elements.