because it doesn't exist, as i stated earlier... btw, you are obviously unaware that the drive i posted has a five-year warranty, and it has no power cycle rating.
There is a load/unload cycle count spec that does exist, and in effect supersedes the start/stop because each start or stop is one load/unload. Also, Seagate (and probably others) still do publish a start/stop cycle spec.
Even if the start/stop spec is not an issue (because one could not reasonably start and stop a computer 100,000 times in 5 years) does not mean that one can start/stop a computer (cold start) indefinitely without some theoretical wear and tear on the drive.
Since one cannot cold start/stop a computer 100,000 times in 5 years, there is not need to mention it in the warranty. The load/unload is not mentioned either, but they do publish a spec on it.
Furthermore, warranties have little to do with reliability, and everything to do with marketing. Hyundai Motors pioneered the 10 year - 100K power-train warranty in the US when their cars had serious reliability problems about 15 years ago (their reliability has improved significantly since then). Automakers with cars considered to be much more reliable offer shorter warranties, because they can (and people will still buy their cars).
that doesn't surprise me, given how you told us was that "it would be absurd to suppose that one can reboot a computer an infinite number of times without some adverse affect to a hard drive".
I said right up front that on modern disk drives there is no real worry about a reasonable number of reboots.
you gave us that stupidly impossible scenario, in what i guess was a failed attempt to back up your earlier mistake.
now you can't understand how power cycling is so irrelevant to longevity that it's not excluded from even a five-year warranty.
That does not mean there is not wear and tear on a disk drive from a cold reboot, because there is. It means that disk drive engineering has improved significantly so it is no longer a practical issue (Seagate rates there drives for 100,000 start/stop cylces). But at one time this was a real issue for disk drives.
Again, your understanding of warranties, and what they signify, is in error.