Formatting an MFM hard drive as RLL - will it work?

When RLL hard drives and controllers became available for personal computers in the mid-1980s, it quickly became discovered that you could format your existing MFM hard drive using an RLL controller for a 50% gain in capacity. But not all hard drives handled this well. Let's throw the Epson Apex Plus's 20 MB Kyocera KC-20B MFM hard drive on an RLL controller, and see if we get a 10 MB increase, or if it will fall on its face. Table of Contents: 0:00:00 - Introduction and Background 0:20:45 - Installing the RLL controller 0:27:22 - Testing the RLL controller 0:33:12 - Low-level formatting 0:46:57 - Testing with SpinRite 1:01:28 - Conclusion Follow me on Mastodon: https://tech.lgbt/@themaritimegirl Patreon: https://patreon.com/themaritimegirl