The Apple M0131 drive was designed to replace the 400K-only M0130 for the early Macintosh models. This half-height drive is smaller than its predecessor, offers a smoother intake and eject mechanism, and reads both 400K and 800K diskettes. Unlike its successor, this does not work with Apple II models. However, the drive is an all-around great addition for a collector or vintage user. I have owned several and never had any issues.
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