The splice method has recovered bad sectors in nearly every instance. My other IBM diskettes, both 5.25 and 3.5, work flawlessly. The attached image shows the results of the Supercard Pro reading the diskettes. The bad news is the diskette drive motor no longer spins. The good news is that I have a physical IBM PS/2 Model 50z (Micro Channel) on my shelf. I ran across several old diskettes formatted this way.
When the PS/2 was readily available, I never thought to copy these diskettes to the standard, dual punched high-density diskettes. The diskettes work flawlessly in the PS/2 series (50z, 55sx, etc.) and they weren't readable on IBM clones. The IBM PS/2 series allowed a 720 K floppy disk, without holes punched, to be formatted at 1.44 MB. Unfortunately, they are standard formatted but non-standard bit rates and possibly rotation. They are low-density diskettes formatted as high-density. I have 3.5 diskettes that are IBM PC formatted and I am trying to read them with the Supercard Pro.
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