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The principle still matters. Learning how underlying storage works helps optimize data layout, write and read for speed.

It’s just that storage has changed. Caches may be important now for instance

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It has changed such that the "traditional" CHS order hasn't been the physical layout of HDDs for probably at least two decades now. Not long ago I posted an article with more details of that: https://news.ycombinator.com/item?id=39428728

I was thinking the lesson from CHS->LBA could be equally well drawn, without bringing in obsolete tech, by exercises involving H:M:S->S or perhaps even D.M.Y->Julian Day.

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