DWPD = drive wipes per day I'm guessing that's over the warranty period of 5 years, so for the 800 GB drive, 800 GB/day * 365 days/year * 5 years = 1460000 GB of writes, or 1425 TB of writes
There are 2 mentions of DWPD (and it is writes not wipes) and 5 mentions of DPWD, which I hope doesn't stand for "drives per write day", as in number of drives that will cr@p out in a day of writing ;)
For anyone who doesnt know, DWPD is drive writes per day, a measure of endurance. if a 100GB SSD is rated for 1 DWPD, that means it is rated for 100GB worth of writes to the drive every day for the warranty period. The same size drive with a 10 DWPD rating could have 1TB of data written to it per day for the length of the warranty.
What I want to know is when can we expect consumer 7.68TB drives?
The slide indicates that the DWPD value is configurable to 4 values of between 1 and 25. Is this a factory configuration (ie binning); or something that can be done by the end user? In the latter case, I'd assume the higher DWPD values come at the expense of more spare area; but how big of a hit is it?
Well yea, but I can't seem to find anything online. What about Samsung's consumer pro line? If a drive is rated for one drive write per day for 5 years, how much would, say, 25% OP improve on that? I mean in terms of endurance. All I found online was how it improves performance and consistency, but not endurance.
Check out anandtech's driver consistency in the SSD reviews for the effect to be tested. BTW, I believe that is the only useful metric for comparing SSD's.
It would be a change that Toshiba can make, not the user. It would be settings in the firmware related to over provisioning and stuff. They don't actually have higher quality NAND in them for the higher DWPD, the 3 DWPD drive uses the same eMLC NAND as the 25 DWPD one, but would have much much more over-provisioning.
There was a good presentation on WAF/OP relationship at FMS this year. The takeaway is that WAF is a function of OP, so all modern drives behave more or less the same.
LOL, the BOM is probably somewhere in the order of $8,000 given the used components. Taken into account the ridiculous amount of engineering put into this thing, the still small market and the warranties I wouldn't be at all surprised it they're actually selling it at a loss for now...
8 grand is enough to buy 4 full wafers of nand from TSMC or GlobalFoundries (on 16nm/14nm FF), Nand is much easier and cheaper per wafer. Please tell me which components you think raise the bill of materials that high
High-density eMLC is very expensive. And your wafers are not worth snitch without testing and packaging which costs also a good deal of money and will get rid quite a few of the chips you have on a wafer. Please feel free to cite some sources where you suspect you can find 8 TB of 128 Gb eMLC x16 packaged memory for less than $8000 and I'll happily agree that $50 would probably suffice for the PCB including the controller and the casing...
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ddriver - Friday, August 12, 2016 - link
What's "DPWD"? A typo, or something unspeakable involving WD?chlamchowder - Friday, August 12, 2016 - link
DWPD = drive wipes per dayI'm guessing that's over the warranty period of 5 years, so for the 800 GB drive, 800 GB/day * 365 days/year * 5 years = 1460000 GB of writes, or 1425 TB of writes
ddriver - Friday, August 12, 2016 - link
There are 2 mentions of DWPD (and it is writes not wipes) and 5 mentions of DPWD, which I hope doesn't stand for "drives per write day", as in number of drives that will cr@p out in a day of writing ;)It is obviously a typo, but curiously persisting.
Ryan Smith - Friday, August 12, 2016 - link
Drives Per Write Day, I like that!TheinsanegamerN - Friday, August 12, 2016 - link
Drive writes per day, a different way of measuring endurance.ddriver - Friday, August 12, 2016 - link
I know what DWPD is, I was asking about DPWD. Pay attention!woggs - Friday, August 12, 2016 - link
It was a typo, which is obvious because it's DWPD in the Toshiba foil. Pay Attention!ddriver - Friday, August 12, 2016 - link
The day you stop living is the day you stop appreciating accidental humor ;)Murloc - Saturday, August 13, 2016 - link
yeah the Toshiba acetate definitely tells the right story.TheinsanegamerN - Friday, August 12, 2016 - link
For anyone who doesnt know, DWPD is drive writes per day, a measure of endurance. if a 100GB SSD is rated for 1 DWPD, that means it is rated for 100GB worth of writes to the drive every day for the warranty period. The same size drive with a 10 DWPD rating could have 1TB of data written to it per day for the length of the warranty.What I want to know is when can we expect consumer 7.68TB drives?
Michael Bay - Sunday, August 14, 2016 - link
Probably five years after somebody finally reaches 2Tb 850evo in price and availability.So, god knows when!
mdw9604 - Sunday, August 14, 2016 - link
Probably 4 years or so.DanNeely - Friday, August 12, 2016 - link
The slide indicates that the DWPD value is configurable to 4 values of between 1 and 25. Is this a factory configuration (ie binning); or something that can be done by the end user? In the latter case, I'd assume the higher DWPD values come at the expense of more spare area; but how big of a hit is it?ddriver - Friday, August 12, 2016 - link
It would be somewhat usable to be able to chose the amount of OP, but still it won't do miracles. You will have to give up some to get some.lilmoe - Friday, August 12, 2016 - link
Do you know a good reference/chart for the effects of different OP values in general? Something that isn't drive specific.extide - Friday, August 12, 2016 - link
Well it really depends on the firmware in the controller and how good they are at keeping write amplification under control.lilmoe - Friday, August 12, 2016 - link
Well yea, but I can't seem to find anything online. What about Samsung's consumer pro line?If a drive is rated for one drive write per day for 5 years, how much would, say, 25% OP improve on that? I mean in terms of endurance. All I found online was how it improves performance and consistency, but not endurance.
surfnaround - Sunday, August 14, 2016 - link
Check out anandtech's driver consistency in the SSD reviews for the effect to be tested.BTW, I believe that is the only useful metric for comparing SSD's.
extide - Friday, August 12, 2016 - link
It would be a change that Toshiba can make, not the user. It would be settings in the firmware related to over provisioning and stuff. They don't actually have higher quality NAND in them for the higher DWPD, the 3 DWPD drive uses the same eMLC NAND as the 25 DWPD one, but would have much much more over-provisioning.Kristian Vättö - Saturday, August 13, 2016 - link
There was a good presentation on WAF/OP relationship at FMS this year. The takeaway is that WAF is a function of OP, so all modern drives behave more or less the same.http://www.flashmemorysummit.com/English/Collatera...
Morawka - Friday, August 12, 2016 - link
$50 in bill of materials and they charge $12,000 for the drive. wonder what the profit margin is on these high capacity SSD's?Lonyo - Friday, August 12, 2016 - link
Whatboozed - Sunday, August 14, 2016 - link
theDaniel Egger - Friday, August 12, 2016 - link
LOL, the BOM is probably somewhere in the order of $8,000 given the used components. Taken into account the ridiculous amount of engineering put into this thing, the still small market and the warranties I wouldn't be at all surprised it they're actually selling it at a loss for now...Morawka - Friday, August 12, 2016 - link
8 grand is enough to buy 4 full wafers of nand from TSMC or GlobalFoundries (on 16nm/14nm FF), Nand is much easier and cheaper per wafer. Please tell me which components you think raise the bill of materials that highDaniel Egger - Friday, August 12, 2016 - link
High-density eMLC is very expensive. And your wafers are not worth snitch without testing and packaging which costs also a good deal of money and will get rid quite a few of the chips you have on a wafer. Please feel free to cite some sources where you suspect you can find 8 TB of 128 Gb eMLC x16 packaged memory for less than $8000 and I'll happily agree that $50 would probably suffice for the PCB including the controller and the casing...Kristian Vättö - Saturday, August 13, 2016 - link
TSMC and GF don't make NAND. NAND and DRAM are very different from logic and SRAM, which is why you don't see the general CMOS fabs printing any NAND.HomeworldFound - Friday, August 12, 2016 - link
I never thought I'd see the day where we had 7TB SSD drives available. I know its expensive but its still amazing.bill.rookard - Friday, August 12, 2016 - link
Lol. Then don't look at Samsungs 60TB SSD. They don't have a price listed for that behemoth yet. I'm guessing about of a new Tesla model 3.