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35 passes was always overkill. 35 was the sum of each of 3 patterns, and each of the 3 was only ever relevant on a certain kind of MFM disk. The "Gutmann method" is completely irrelevant on a modern hard drive.

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Moreover, my understanding is that modern magnetic storage is, during normal operation, functioning very close to the limit of what the media can store, and what we have the technology to read; the concept that electron microscopes can recover overwritten data was only true decades ago. With this in mind, even a single-pass overwrite is likely to be sufficient for most purposes -- if we had the technology to recover data after it's been overwritten, we'd be using that technology to double hard disk capacities.

"if we had the technology to recover data after it's been overwritten, we'd be using that technology to double hard disk capacities."

If we have the technology, then like an electron microscope, it might not be feasible to implement at a size and a cost that would be viable in a storage product, but would be viable as a forensic analysis tool.

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