Assistance - Calling all Samsung EVO owners

before secure erase/restore
before_zps78f125aa.png~original


after secure erase (drive blank+unpartitioned)
aftersecureerase_zpsde605b23.png~original


after reflect has restored the image which was giving the results in the first image
afterrestore_zpsfb24f278.png~original


(SATA3 controller on PCI-e x1 port so not full SATA3 speeds)


From what I have seen with this drive, it looks like new drives need to be secure erased before they are even used. Maybe there is a firmware issue with the drive using areas which have not had any data written to yet and the secure erase sorts whatever this issue is out.
 
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ANDARIAL said:
;)Time to come clean here it was a `naughty`W7.stuck on a solid blue screen no icons or control over the pc
Click to expand...

Didn't get to desktop then. That can be a bit more tricky.

I`ve rescued a couple of PCs in this situation by booting from a Windows 7 install disc and selecting "Repair".
 
Kotu said:
before secure erase/restore


after secure erase (drive blank+unpartitioned)


after reflect has restored the image which was giving the results in the first image


(SATA3 controller on PCI-e x1 port so not full SATA3 speeds)


From what I have seen with this drive, it looks like new drives need to be secure erased before they are even used. Maybe there is a firmware issue with the drive using areas which have not had any data written to yet and the secure erase sorts whatever this issue is out.
Click to expand...

Similar to my theory.

I suggested that a firmware update could have made things go wrong. A secure erase after that update gets things sorted.

Just a theory.
 
I did not update the firmware on mine though, it was only bought recently and came with the most up to date firmware already on it.
 
Just for info - run HDtune on my 250G 840 standard (1yr and 4 months old and circa 132G of data on it) and its fairly static around the 240 MB/s mark - I'm on an Intel Sata II controller, so that's about right.

Ran the prog on my daughters 250G EVO (3months old and circa 60G of data on it) connected to a Marvel Sata controller hanging off of a PCIE 1X slot - it peaks at 150MB/s (as expected) but the first 30% it spikes between 150 and 30MB/s - really quite ugly :-( . So it's not a TLC issue, it's an Evo issue.
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Scrub that - tested the wrong SSD - please see below, graphs for an 840 standard, an 840 Evo and a Crucial SSD - the difference between the Crucial MLC and Samsung TLC's is clear....

Samsung 840 Standard



Samsung 840 Evo



Crucial SSD

 
So what we know so far -

1. HDtune Pro Trial seems to work properly. 2.55 useless.

2. Drives are some how getting in to a really bad performing state which seems from our testing to date happens over time.

3. Even fairly new drives that did not need a firmware update show this issue.

4. Secure erasing the drive and restoring the image restores performance. So it's not the file data pattern causing it.
 
Aurhinius said:
So what we know so far -

1. HDtune Pro Trial seems to work properly. 2.55 useless.

2. Drives are some how getting in to a really bad performing state which seems from our testing to date happens over time.

3. Even fairly new drives that did not need a firmware update show this issue.

4. Secure erasing the drive and restoring the image restores performance. So it's not the file data pattern causing it.
Click to expand...
Add to that:

5. CPU state has an undefined impact on consistency and magnitude of benchmark results.
 
agreed and to be honest I think Samsung needs to fix this. A drive should not get in this read performance state that we are all seeing.

Write performance may be but read performance no.
 
lj6j2M9.jpg

94 gig on it now.not looking too bad
It`seems` to be improving ,more flat line than it was earlier today.Not as good as just after the windows install though
 
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only thing ive experienced which was similar to this was on a corsair force gt,where performance would drop off in benchmarks until I secure erased it,then it would last another 6 months or so

just put it down to poor controller maintaining the drive
 
littlepuppy said:
Been reading and following this, think I will dump my Evo and get an intel.... Cheers for the work people
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A bit hasty, I think.

Until I started to read this thread, and carried out the test with HD Tune, I wasn't aware of any problem with my Evo. And it's not like there have been any reports of these SSDs failing, due to this, or any other problem (not in any significant number anyway).

I`ve "repaired" my SSD by doing a secure erase and restore. The benchmarks now look very healthy, but I can't say that my PC feels any faster - it was "fast" before I knew of the issue.

The cause of the problem has yet to be revealed, and I would hope that Samsung are seriously looking into this matter.
 
I have to say the samsung secure erase tool is pants tbh,couldnt get it to work,ended up using parted magic which did it no sweat

same for the Samsung data migration tool,it also failed,ended up using paragon migrate
 
wazza300 said:
I have to say the samsung secure erase tool is pants tbh,couldnt get it to work,ended up using parted magic which did it no sweat

same for the Samsung data migration tool,it also failed,ended up using paragon migrate
Click to expand...

I`ve only ever used Samsung's secure erase a few times, but it seems to work fine for me. I`ve tried erasing a secondary SSD from within Windows, and when I erased my own SSD a few days ago, I made the USB memory boot utility and used that.
 
this is now the samsung bad press thread :o
i still think its a hdtune problem with this particular samsung drive and the reading it is getting is "buggy"
tho i have nothing to prove this and its just a guess :)

i would like to see any real world tests that back up hdtune's findings
if i transfer a 4gb movie i am getting 450mbps, it does not spike up and down at all, hdtune tells me i should be getting 50-100mbps!?
that to me doesnt make sense
 
Ran the test on my nearly empty 1TB EVO and it started at about 50MB/s and quickly shot up to 400MB/s (ish), pretty much where the data stopped.

Did a secure erase, which was a pain as the drive was apparently frozen. But got there eventually.
Not the drive starts at 250MB/s and goes up to 400MB/s much quicker.
 
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