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Flash SSD Tech Talk
Source: Tom's Hardware – Keywords: ssd, memoright
Syndication:
Flash SSD Tech Talk
There are two types of Flash memory: NOR and NAND. NOR provides an external address bus and can thus be directly addressed by storage controllers. Hence, it is possible to directly execute code from NOR flash memory, making it the proper choice for firmware applications. However, NOR also does not feature bad block management mechanisms. NAND flash can only be accessed in larger blocks, which are organized in so-called pages, in order to boost throughput. Thanks to this layout, the number of connections is smaller than with NOR. Also, NAND memory oftentimes comes with an integrated controller, which takes care of bad block management and wear leveling algorithms. This allows manufacturers to sell NAND Flash even if a few bad blocks are available. While this sounds like a disadvantage, it is actually an advantage for higher capacity storage, as it allows for production yields to be significantly increased and keeps flash memory prices low for current and upcoming memory densities.
But there is one more difference between flash memory devices, as flash cells can be designed to store either one or multiple bits. Single-level cell flash (SLC) stores a single voltage level, while multi-level cell flash (MLC) can store at least two bits. SLC chips hence are significantly faster and more energy efficient than their MLC brothers, and they typically sustain more write cycles than what MLC offers, although this should not be an issue for desktop users anymore.
Manufacturers typically don’t break down the technical details about what kind of flash memory that they offer in their data sheets for flash SSDs, although we think it would be good to know these specifics for a particular product. At the same time we have to emphasize that it’s impossible to assess or even estimate a flash SSD’s performance by only looking at the technical specifications. While manufacturers should be straightforward with throughput numbers and these are mostly reliable, a 2.5” Flash SSD’s throughput can vary between 25 MB/s and 115 MB/s (like Memoright’s SSDs).
Most flash SSDs were designed for 2.5” or 1.8” form factors, as flash-based hard drive are mostly interesting for mobile use given their robustness and lower power consumption. Also, the lower capacities of 16-128 GB can be sufficient in laptops, but hardly for desktop PCs. Should you still want to use a 2.5” Flash SSD in a desktop environment, then it would be easy to purchase a frame to install the 2.5” drive into a 3.5” bay. Western Digital has also gone down this road with its latest enthusiast-class hard drive, the VelociRaptor, which is a 2.5” hard drive at 10,000 RPM that is shipped with a 3.5” frame to cool the drive and allow installation in conventional desktop environments.
Lastly, flash drives provide a larger temperature range and better robustness for industrial applications. While hard drives may be operated at 5-55°C with few exceptions, most flash drives sustain temperatures of 70°C and industrial-grade drives can handle temperature ranges of -40°C to 85°C, which will work for car infotainment solutions geared for polar or desert climate zones.
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The key here is that SSDs are optimum for big retailers & enthusiasts, because of the lower failure rate compared to mechanical drives means less hardware failure and RMA and tech support calls. For us, its performance based. Dell and others will flock to these when the pricepoint hits home, and as soon as they jump on, drives will sell in such volume that new plants will have to be made and we'll need SATA-1000 before long.
Anyone whose been in the industry professionally and watched tech roll out over the years can see the writing on the wall, SSDs will dominate at least the "bootdrive" sector within two years. It might take longer to ramp up capacity for the "data" drives for home users, but its coming, and every process shrink to a smaller fab makes capacity go up exponentially.
personally i'm still waiting for the o dB (SIL) machines and for the 10 milisecounds to boot up an Operating system =D
HDD's are slower, but they can be as low as a quarter per gig. I'll stick with my 160GB seagate.
The ONLY, and I mean only, area where ssd drives will get consumer exposure will be in the laptop sector, simply because of the size/power requirements. For that to happen, ssd prices will need to fall "tenfold" and conventional hard drives will need to die out, which won't happen any time soon.
Desktops will will continue to use conventional hard disks for at least the next 5-10 years as they will go down in price and increase in capacities. Sata III 6gbps and newer pmr technologies will keep the traditional hard drive alive for a long time yet.
Servers may transition into a hybrid environment with both ssd and conventional drives, but with the cost of raid now so affordable (controllers incorporated into chipsets) and the fact that traditional fast (velociraptor) and beefy (terabyte) drives will ALWAYS be cheaper than the ssd variants - it's going to be a hard sell.
I'm not saying ssd is bad, but for those who don't have 5-digit monthly income, it is merely a toy for the rich. Sure, prices will eventually fall, but until you can sell the technology for 25 cents/gig or better, it will remain insignificant.
| geralt : SSDs have weakness in random writes and reads. Unfortunately this was not tested here. |
A mix of SSDs and HDDs will probably be the best solution for a long time. They each have their strengths depending on usage patterns. As soon as SSDs become more economical, mixed setups will quickly become the norm. I would have a couple of SSDs in a RAID 0 config to boot on and load applications off of, but I would have a some HDDs in a RAID setup for mass storage.
I really can't wait to build my next system. Gone is the day where I reuse a harddrive on a new build, and the new computer seems only as fast as the old one due to the HDD bottleneck.
As someone else commented on I am HORRIBLY disappointed that Tom's didn't test random writes and reads. If they actually didn't that is, I haven't finished the article but wanted to respond to the "clown" guy. I've noticed a lot of stuff like that with tech sites and it makes me wonder what kind of enticements these guys have to talk up a given product. Please do a follow up with random read&write tests.
as fas as the size goes. there is only a small amount of XP/Vista that needs benefits from super fast access. Your application and it's data are usually the best canidates for super fast storage.
/And yes show us the random access tests since you do talk about OS storage.
...Taking Mother's Day present out of Shopping Cart, putting MemoRight in...
Give me a break. Maybe years from now but that's not exactly news. Anyway, when it finally happens this specific model will not be the one to do it. It may end up being an entirely different technology that ends the HDD if SSD's don't drop in price fast enough.
Drop the sensationalism, start labeling both the X and Y axis of your graphs like professionals, and try to regain some journalistic integrity.
Toms is going downhill fast.
In fact, even if the 32gb ssd drive was $300, I would still have a hard time justifying the cost for such little space. 128GB at $300-$500 and I MAY think about buying one or more of these.
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This has about the same marketing hype as ddr3 compared to ddr2.
I could care less about access times.
I am not paying their prices for a 32gig "SSD".
It is just not worth the money.