some HDD's reduce its rpm when shock is detected. Its an undeniable fact, some HDD's do have that feature especially the notebook types.
You said the HDD 'breaks' when it fails to reduce rpm when shock is detected. That is false. Reducing rpm takes time. Much longer than the shock lasts. Reducing rpm will sooner lower head flight height and increase chances of a head crash. The only thing a HDD can do to prevent a head crash is to move the head away from the surface. Rpm has NOTHING to do with this. So stop talking nonsense.
SSD limited number of writes exist at some point. With many SSD drives failing in its early release, i wouldnt trust its technology just yet.
Your information is outdated and wrong. Either learn the facts about the state of technology of today, or just shut up please. Because spreading lies does nobody any good.
keeping away trash from your ssd is the best option here. It will slow down anyway if it gradually fills up.
So does a HDD. No space for defragmentation and file placement optimization on a nearly full drive. Resulting in more writes to the same sectors left free, physically wearing them out. An SSD can still move most of it's data around to keep the freshest cells available. This is what wear leveling is and does.
And let's not forget a HDD usually starts filling up from the outer tracks to the inner tracks. So the fuller a HDD is, the slower it is. In both reads and writes. Because these now happen from the tracks more to the center of the drive, which results in less sectors passing under the heads every seconds. This can easily cut throughput in half. Unlike an SSD. The SSD will keep reads up to speed, and writes will only suffer once garbage collection is forced to operate in real time. Which is in itself unlikely, because a SSD will process writes so fast it usually has plenty of time to manage cells between writes, whereas the HDD is still busy putting the data to disk. Waiting for the right sectors to pass under the heads, moving those heads, ect.
Old trait? HDD still has the best write durability.
You keep saying this. Prove it. Show hard data that supports your claim. This too is outdated information.
In the time a HDD does one write, an SSD can do hundreds. Even time for time, an SSD will typically outlast a HDD, let alone if you actually use a HDD for long enough to equal the write count from the SSD. Which would be decades.
Little risk.
Funny. Using the SSD for these writes is so little risk it can't even be measured.