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Raw photos are 30-100MB in size. Going through your shots on an HDD is excruciatingly slow.

Not the person you replied to, but bulk exports from something like Lightroom or Capture One benefit from faster speeds. If you have a fast enough CPU and enough memory, the main bottleneck is I/O. It doesn't matter for a few photos, but when you want to (for example) convert a whole trip worth of processed raws to JPG, every MB/sec counts.

>Opening a single picture is a sequential operation

Exactly what i was thinking!

Laptops tend to not have HDD slots anymore.