Good lord. HDD cache software is still being sold?
Such oil snake software (which have small impact or has unmentioned danger, while also collect your personal data) still has place today. IMO the worst offender would be game/FPS booster.
Going to disagree with you both a very very little bit on this. 99% of the time you are right.
For the most part for it's crap and does nothing. However, you do have to put in a 'but'.
On older systems, with slower hard drives, and yes there are a ton of machines out there with 5400RPM drives, it does help.
And keep in mind some OEMs made PCs with 1TB 5400 RPM drives with no onboard cache to meet a price point.
Today, 4GB sticks of DDR3 RAM are very cheap to the point that a lot of IT people just give it away since it has no real use at all anymore.
So in the situation of old PC, slow crap drive, free extra RAM. Yes it does help.
And you don't have to buy a better drive or clone your old drive or do anything like that.
Like I said very limited good comes from it, but not zero at all times.
-Dave