For "spinning rust" vs. "fancy sand" (mechanical hard drive vs. solid state), the big difference is usually in the read speed, but not so much the write speed.
For a mechanical drive, read and write are close to the same, because the same constraints dominate both: it has to physically move the head to the right radius, and then wait for the platter to come around to the right angle. Only then can it read or write to a given spot. But if it can read or write sequentially, not jumping all over the place, it can still saturate a modern SATA connection either direction.
For a solid state drive, it can read anything almost instantly, because it's all electronic with nothing moving. It requires an even *faster* connection to keep up with that, which I believe M.2 is. But writing requires it to explicitly erase what used to be there and then write new, and both are relatively slow. So it's closer to a mechanical drive in that sense. The TRIM command is essentially a bulk erase of everything marked as free, so that can speed up writing later, but it only does half the job. The write itself is relatively slow too.
(TRIMming an SSD effectively replaces defragging a HDD, as the required periodic maintenance. Windows' defragger does both, and picks the right one automatically.)
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That's not to say that you should still use a mechanical drive to record on. I do, and it's fine, but modern solid state is still faster at the connector than mechanical is at the connector. Like usual for computers, there are tricks to make that work, like caching a bunch of writes to do all at once instead of one at a time. Each cell still takes a while, but multiply that rate by the size of the cache, and now it can easily keep up.
But if you kill or lose power at the wrong moment, then what you thought was saved - and you *did* in fact click the button - isn't. Only after a complete shutdown, or explicit ejection of removable media, are things the way you think they are.