It has been years since anyone from the tech media dared to draw a graph about when SSDs will achieve parity with HDDs for capacity and for cost per GB - it used to be a very popular topic that produced lots of forecasts and nice graphs, of which absolutely none really held true. We have been forecasted price parity "in a few years" practically since 2012, but 12 years later journalists have apparently gave up.
This graph was produced on Reddit, and it's again showing price parity in about 5 years. It is of course using cheapest price per TB available, so it of course looks at cheaper, older drives and lower capacity. I guess if you made it for maximum available capacity the SSD line would practically flatline for the last 4 years - which wasn't the case before 2020, arrival of M.2 and total stagnation of maximum available capacity.
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It also looks at best value with one data point per year, so even if it would be up to date (it's one year old), it wouldn't even show the terrible price gouging we had from last autumn until recently, when SSD prices finally fell to nearly pre-price hike levels. So it would take price levels for 2023 from pre-price hike, and for 2024 after it, maybe from some limited deals (Black Friday, end of year sales etc.). Right now the cheapest price per TB is still at 47.50 EUR, 53 USD - more than 50% higher than last year's entry.