Samsung 850 SSD Review

[Guest]

Samsung released a new 850 SSD in China, but this may be a new model coming to the rest of the world. With up to 540 MB/s sequential read and 520 MB/s sequential write performance, this would be a popular SSD.

Samsung 850 SSD Review : Read more

 

[revanchrist]

Would like to know more about the rumored 4TB QLC drive from Samsung.

 

[DerekA_C]

ha shortage my BUTT it's a cash cow right now as everyone is trying to switch over so why not make a few extra billion of gullible people just like everything else the fabs the money the time and investment is already there for years yet prices hiked bogusly, no one can convince me otherwise same with the GAS shortage all a bunch of BS to make extra billions to screw the population over PERIOD. Oh just like the LCD TV panel shortage HA then 4 companies including Samsung sued for 1 billion for strong holding the market. Practice as usual the elite finding new ways to make themselves more rich and powerful.

 

[USAFRet]

So how is this new and different from the current 850 EVO drives?
This, from my existing 850 EVO:

Yes, mine is a 500GB vs the test subject of 128GB, but just because there is a different TLA at the end of the model number does not make it 'better'.

 

[zodiacfml]

Not bad. I could use one but I bought 250GB EVO just a few days ago to match a 4TB HDD

 

[bit_user]

Please try to report the power-off data retention time of SSDs you review. As bits are being packed more densely, I suspect this number is falling and might already be low enough to cause issues for some people. For one MLC SSD I own, it's just 3 months.

 

[jeffs7897]

Uh....that would take...TIME. We would be reading this test next year.

 

[Jeffs0418]

Please try to report the power-off data retention time of SSDs you review. As bits are being packed more densely, I suspect this number is falling and might already be low enough to cause issues for some people. For one MLC SSD I own, it's just 3 months.

How does one determine Power-off data retention time without TIME? That would fall under the Long-Term test.

 

[mapesdhs]

Would be interesting to see how this compares to the old 840 and 840 Pro, and indeed the 830, see whether the competition has at least caught up to those older models (excluding the 840 EVO, too many issues with performance degradation over time).

 

[fanafirmino]

Must I endure a video of someone playing games everytime I hit your homepage??? Come on, there must be another way, guys!

 

[bit_user]

Please try to report the power-off data retention time of SSDs you review.

How does one determine Power-off data retention time without TIME? That would fall under the Long-Term test.

It should be specified by the manufacturer, as in the case of my Intel drive. If it's not in the datasheet, then I would like the author to contact the manufacturer and ask them what it is. This will also hopefully send the message that people care about this attribute, and perhaps they'll be more mindful of it.

 

[Jeffs0418]

Please try to report the power-off data retention time of SSDs you review.

How does one determine Power-off data retention time without TIME? That would fall under the Long-Term test.

It should be specified by the manufacturer, as in the case of my Intel drive. If it's not in the datasheet, then I would like the author to contact the manufacturer and ask them what it is. This will also hopefully send the message that people care about this attribute, and perhaps they'll be more mindful of it.

For a manufacturer to provide that info(attribute) with any certainty would extend R&D time unnecessarily. That would be impractical in today's competitive tech market.
Reports of extended Power-off data loss is quite rare as far as I'm aware. Probably because an overwhelming majority of snappy storage(SSD's) users actually don't use them for unpowered long-term storage.

 

[bit_user]

For a manufacturer to provide that info(attribute) with any certainty would extend R&D time unnecessarily.

Why do you think that? In order to estimate endurance, SSD vendors need a pretty good model of the flash memory they're using.

Moreover, power-off data retention is a design parameter of the flash memory circuitry, which the chip maker needs to test in some fashion probably before they even ramp up volume production. Remember that NAND flash is a charge storage device, so all you need to do is look at the self-discharge rate. It's not like you have to wait however many months or years it takes for the data to become unreadable.

Probably because an overwhelming majority of snappy storage(SSD's) users actually don't use them for unpowered long-term storage.

I doubt that. I've had laptops that've sat unused for months at a time. I'm sure there are enough people that leave devices powered off for weeks or months that it matters.

 

[Jeffs0418]

For a manufacturer to provide that info(attribute) with any certainty would extend R&D time unnecessarily.

Why do you think that? In order to estimate endurance, SSD vendors need a pretty good model of the flash memory they're using.

I did say "with any certainty". Endurance estimates are reasonably accurate longevity indicators based. Total TBW(terabytes written) is the number people look for here. TheTech Report actually did put this to the test on a number of popular SATA III units over 18 months until all failed. https://techreport.com/review/24841/introducing-the-ssd-endurance-experiment/5 But that extended project did nothing to address what we are discussing here.

Moreover, power-off data retention is a design parameter of the flash memory circuitry, which the chip maker needs to test in some fashion probably before they even ramp up volume production. Remember that NAND flash is a charge storage device, so all you need to do is look at the self-discharge rate. It's not like you have to wait however many months or years it takes for the data to become unreadable.

Therefore it falls on you to look up the detailed data on the exact NAND flash used in whatever unit you are curious about and extrapolate from there.
That stuff is far beyond my area of expertise.

Probably because an overwhelming majority of snappy storage(SSD's) users actually don't use them for unpowered long-term storage.

I doubt that. I've had laptops that've sat unused for months at a time. I'm sure there are enough people that leave devices powered off for weeks or months that it matters.

My bad. I stand corrected
Sorry about my miserable multi-quote attempt...lol