In message <u0p3bc$qnoo$1@dont-email.me> at Fri, 7 Apr 2023 08:46:36, Paul <nospam@needed.invalid> writesspeed for the last 2% or so! It's consistent - two pairs of runs (I always run it twice) about 3 months apart. (The second run also shows the Access Time - the yellow "milky way" of spots - along the bottom.)
[]
While in Windows, run HDTune benchmark, and look for "bad spots" in the curve.[]
https://www.hdtune.com/files/hdtune_255.exe # ten year old free version[]
On a hard drive, the outer circumference offers better rates than the[]
hub does, which is why the benchmark curve gently declines to half-rate.
When you see stairsteps in the bench curve, that is "zoned recording",
and the formatting of the tracks changes from one part of the disk
to another, on purpose. The stair steps then, are normal, and part of
design.
I have (what I think is a) fairly conventional HD (500G, in a second-hand laptop I bought in January), which displays a fairly normal HDTune curve - flattish up to about 40%, then gentle rolloff to about half speed: but then hops up again to a high
I'll try to include the last pair but they may not attach or propagate.
On 5/3/2023 4:55 PM, J. P. Gilliver wrote:[]
I have (what I think is a) fairly conventional HD (500G, in a
second-hand laptop I bought in January), which displays a fairly
normal HDTune curve - flattish up to about 40%, then gentle rolloff to >>about half speed: but then hops up again to a high speed for the last
2% or so! It's consistent - two pairs of runs (I always run it twice)
about 3 months apart. (The second run also shows the Access Time - the >>yellow "milky way" of spots - along the bottom.)
I'll try to include the last pair but they may not attach or
propagate.
Well, you certainly got your moneys-worth.
It's like something from a Cracker Jack box.
One of your plots, has HDD sequential transfer rate and SSD-like access times.
The piece on the end, *might* be consistent with a short-stroked
drive. A short-stroked drive only uses half of the platter (the
outer half) and the heads never touch the hub. On a short stroked
drive, the transfer curve starts at full rate, but at the end, it
has only declined to about 80% or so. The transfer speed is
mostly consistent over the storage surface.
I am lucky enough, to have acquired just one short stroke drive,
and there is absolutely no notation in the part number, indicating
my Cracker Jack either. I have three drives of that model, two
normal, one is short stroked.
Mine is a a WD 500GB 3.5" drive which is using a 1TB platter inside,
both surfaces are certified, and they only use the first 500GB because
I only paid for a 500GB drive. They make up a batch of 1TB drive,
some become 500GB drives, some stay as 1TB drives. This solves the
problem, of having no platters available any more, to make the
500GB drives.
But that translation, makes no sense. You would not "jump the heads to
the middle of the disk" for the last bit of certified storage on the
drive. What I'm saying is, if your drive was short stroked, the height
of the material on the right, is consistent with a short stroke drive.
But that's just a (weak) attempt to explain where the height would come
from.
But your Access Times of 0.3ms blows the whole charade. Something
like that might happen, via a user adding some sort of Samsung caching >software. Still pretty hard to justify or believe.
There are two anomalies, and I cannot adequately explain either of them.
I'm not saying it's Space Aliens that did it, but it's Space Aliens.
If you were running RAID, had a 500GB hard drive, a 16GB Robson cache,
maybe there would be some way to rig that. (Check and see if your
storage is being run by the Intel RST driver.) Like first, I have to dream
up some materials to make this work. But then the "behavior" part of
the observation, still makes no sense. A Robson cache, I don't think
the curves look like that, and the label for the upper left would
not read the way it does either. There would be an artifact of
the presence of RST for the drive name.
Kudos on your puzzle.
Paul
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