Longsys Foresee S500 SSD Review

Four-Corner Testing

Comparison SSDs

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We assembled a handful of TLC-based SSDs for today's comparison, including the Crucial MX200 with Micron's 16nm MLC. Micron plans to release 16nm TLC in 2016, which should further reduce the cost of flash. But its 16nm MLC was designed to combat the threat from Samsung's and Toshiba's three-bit-per-cell memory. 

To read about our storage tests in-depth, please check out How We Test HDDs And SSDs. Four-corner testing is covered on page six.

Sequential Read

TLC-based drives don't have a problem reading data back from flash. Our testing shows that TLC is comparable with MLC when it comes to sequential read performance over SATA. It's actually a little surprising to see the TLC-equipped SSDs outperforming our only MLC-based drive at a queue depth of two.

But Longsys' S500 falls to the lower end of the graph with two outstanding commands. It still delivers well over 500 MB/s though, so it'd take a discriminating enthusiast to notice a difference.

Sequential Write

Our sequential write performance chart shows a lot more variation. This is due to TLC-based products relying heavily on an emulated single-level-cell cache. The problem with this buffer is that it's small, so it fills up quickly. Our testing involves a reasonable amount of conditioning, which allows us to push beyond best-case conditions and present the performance you'll encounter in the real world.

Random Read

Random read performance is lower on the Longsys S500 and the Adata SP550, both of our SM2256-based contenders.

Of the numbers presented in this section, the one we value most involves random reads at a queue depth of one. It's an important metric that directly relates to your user experience. Longsys' Foresee S500 is slightly faster than Adata's SP550 and OCZ's Trion 100. But it appears well below the QD1 performance available from Samsung's 250GB 850 EVO, though.

Random Write

The random write tests show even more separation between the best and worst products. Samsung's 850 EVO manages to compete with the 16nm MLC-based Crucial MX200. SanDisk's Ultra II sits on an island in the middle, while the Longsys, Adata and OCZ drives trail.

Under normal use, random writes from multitasking stack easily. Because of this, we like looking at the numbers at a queue depth of two or four most of all. A wide separation between our represented models make it easy to identify two distinct performance groups.

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17 comments
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  • kalmquist
    The Silicon Motion's SM2256 based drives have the dubious distinction of being slower than what came before. I'm hoping that once companies other than Samsung get 3D NAND into mass production, we will see SSD's priced like the Longsys' Foresee S500, but with better performance.
  • ansar
    Bah. "S500" is the model name and not the size. :(
  • jtown80
    wonder how many backdoors they included...
  • Jeffs0418
    Quote:
    wonder how many backdoors they included...
    I was thinking the same thing. Just the possibility is a deal breaker for me.
    I just hope the (Korean) Samsung 850 EVO I purchased this year (Made in China)
    has no unwelcome firmware inside.
  • Jeffs0418
    The nice price is suspicious too...
  • photonboy
    The PRICE is right where it should be. It doesn't perform as well as slightly more expensive drives.
  • TbsToy
    Oh boy another cheap, substandard sata SSD with no visible support.
    Walt Prill
  • photonboy
    TbsToy,
    How do you know there is no support? Do you read Chinese?

    These exist in China, so I'm not sure why you would expect to easily find the support site.
  • TbsToy
    67821 said:
    TbsToy, How do you know there is no support? Do you read Chinese? These exist in China, so I'm not sure why you would expect to easily find the support site.


    Well, being in Los Angeles California USA and an English speaking American, I haven't ever felt the need to learn to read and speak Chinese just to be able to communicate with an unfindable Chinese support site for some substandard SSD that might not exist a month from now with a site ya can't even find. I can walk to Intel and with no time, and with no language or communication or warranty or shipment issues back and forth.. So I agree with you cuz ya might not have any usable support like the many SSD vendors have here. That shouldn't deter any potential buyers though, right, cuz it is cheap and ya wanna sell em, Right?
    Walt Prill
  • hannibal
    I just have to wonder, if most of the readers actually did read the article. This is not about Longsys, this is about controller, that will be the dominant controller in the next two years. Expect to see these in low price Samsung, Munchkin, Kingston etc ssd drives in near future.
  • 2Be_or_Not2Be
    "...transfers of any substantial size will cut performance to half of what you can get from a modern mechanical disk."

    A SSD that fails to beat a mechanical disk in every performance metric simply shouldn't be sold.
  • CRamseyer
    Your statement isn't accurate. This and other TLC SSDs are much faster at random access patterns.
  • epobirs
    Quote:
    Oh boy another cheap, substandard sata SSD with no visible support. Walt Prill


    The review makes it clear that end users are very unlikely to buy one of these from the OEM. You deal with a local vendor and their infrastructure. Do you speak Korean or read Hangul? No? Has that stopped you from buying Samsung products?
  • epobirs
    SATA SSDs are going to be a legacy market in just a few years. The cheapest devices will find a place in PCs at the low end before PCI-e connected SSDs take over the entire market. PC hardware and software designers are still coming to grips with how to apply the performance but the difference will become intolerable as the price gap narrows.
  • mapesdhs
    Chris, the Amazon Samsung 850 EVO link has the wrong price, it should be $90.

    Also, what's the point of the Service Time tests? They show no useful variation, at least not in terms of the comparison conveying anything that's relevant to making a purchasing decision.

    Lastly, why is the notebook battery life test graph using a non-zero origin? It means the visual impact of the graph is completely useless. I really wish toms writers would stop doing this, it's very bad practice. The whole point of a bar graph is to use the bars themselves as an immediate visual indication of variation, but non-zero origins make this impossible.

    Either way, once again, still no reason to get anything other than an 850 EVO atm, down to 114 UKP in the UK for the 500GB, below 60 for the 250GB. Amuses me to see people bidding more for other used inferior models on eBay. :D
  • hst101rox
    Quote:
    SATA SSDs are going to be a legacy market in just a few years. The cheapest devices will find a place in PCs at the low end before PCI-e connected SSDs take over the entire market. PC hardware and software designers are still coming to grips with how to apply the performance but the difference will become intolerable as the price gap narrows.

    The difference in performance in a desktop system will be minimal in most cases, except big file transfer jobs and the like. ~500MB/s is plenty! Your back to the CPU/ memory bottleneck for the most part.
    It'll be fun to see the 2TB Samsung SATA SSDs drop in price over time

    I don't see why anyone would buy this Longsys Foresee drive over a used 840 or 850 Evo on Ebay. mid range consumer SSDs don't really cost more than a low end SSD.
  • mapesdhs
    1748327 said:
    ~500MB/s is plenty! ...

    There's a long history in computing of people saying things like that which end up just being embarassing some years later. ;) Remember the old, "640K ought to be enough for anybody", by a certain Mr. Gates?

    When consumers start meddling with 4K video, suddenly "only" 500MB/sec will become annoying. It's not that far off. And the 450MB/sec I had this week when copying 140GB between two 500GB 850 EVOs definitely did not feel fast - oh how we get used to the quicker stuff so easily. Data expands to fill the space available, and patience shrinks to fit into the gaps. :D


    1748327 said:
    I don't see why anyone would buy this Longsys Foresee drive over a used 840 or 850 Evo on Ebay. ...

    I don't know why anyone is bothering with used EVOs on eBay atm when the cost of a new 250GB/500GB is so good. I've seen several UK listings these past couple of weeks where people have bought used SSDs for more than the cost of a new 850 EVO. That's just nuts.

    I bought another 850 EVO 250GB today, 58 UKP from Amazon. Really good price IMO, but it keeps dropping. The 500GB was at 113 a day or so ago.

    Ian.