factor for 5yrs*365 for 1DWPD ~1825 and for 3DWPD ~5475 times capacity, results to lowest of both variants being around 7000TB and highest (with 25.6TB 9550 MAX) ~140160TB or 135PB (?)
I mean, they are basically just leaving the math as an exercise for the reader. I don't particularly appreciate it, but it's not like they are changing the game.
For the market they are in, people mostly want to know how many DWPD they can handle. They don't care about total written data.
when your the XYZ Corp. buying by the thousands, all you care about is certified performance to warranty date. your going to trash the drives just a nanosecond before reaching it. it's all just a business expense, and the drive that meets the spec at lowest cost per bit/byte/year will be bought. the NAND could be made from sheep's dung for all the Bean Counters care.
DWPD is good that it does not depend on capacity and immediately tells you about how many P/E cycles each cell sustain. 1 DWPD means for example 1825 cycles if warranty period is 5 years (365*5)
Question is - does 3 DWPD mean some new 10x better than typical technology for TLC or the company hired some superbright flashlight or unseen capacity lithium batteries sellers from eBay to run marketing department?
No, the flash in both series is identical (232-L TLC), as are the controllers. Note that the MAX series has a much lower (usable) capacity. That's flash over-provisioning to make them reach 3DWPD.
The fattest model had 5+ TB of flash trimmed, to use as a spare for destroyed cells replacement. So the flash is nothing special; the SSDs simply trade lower capacity for higher endurance.
"So the flash is nothing special; the SSDs simply trade lower capacity for higher endurance."
but, but... weren't we promised that this new fangled 3D TLC/QLC NAND would last LONGER than olde fashioned planar NAND because it would be fabricated on legacy XXnm nodes?? did they fib?
Well, not, it is does not tell you anything immediately, because that value depends on the time frame you consider as valid. To know how good is that value, you have to know the warranty period. The absolute quantity of minimum guaranteed writable data instead does not depends on time. You know you can write N TB of data before a cell retention capacity may be compromised. Doesn't matter when and for how long.
5 years is the standard warranty duration across tiers and for the mainstream consumer and server markets. Industrial and embedded flash can be longer, but those are quite rare, and specced both ways.
On balance, I find DWPD is a much nicer spec too parse than TBW/PBW, especially when looking at drives with wildly disparate capacities (like the S3610 for example, where the smallest is 128GB, and the largest a nice 1.6TB).
We’ve updated our terms. By continuing to use the site and/or by logging into your account, you agree to the Site’s updated Terms of Use and Privacy Policy.
Facebook
Twitter
RSS
11 Comments
Back to Article
[email protected] - Wednesday, July 24, 2024 - link
Power consumption a bit high. Endurance now eschewed from TBW to DWPD?back2future - Thursday, July 25, 2024 - link
factor for 5yrs*365 for 1DWPD ~1825 and for 3DWPD ~5475 times capacity, results to lowest of both variants being around 7000TB and highest (with 25.6TB 9550 MAX) ~140160TB or 135PB (?)James5mith - Thursday, July 25, 2024 - link
I mean, they are basically just leaving the math as an exercise for the reader. I don't particularly appreciate it, but it's not like they are changing the game.For the market they are in, people mostly want to know how many DWPD they can handle. They don't care about total written data.
FunBunny2 - Saturday, July 27, 2024 - link
" They don't care about total written data. "when your the XYZ Corp. buying by the thousands, all you care about is certified performance to warranty date. your going to trash the drives just a nanosecond before reaching it. it's all just a business expense, and the drive that meets the spec at lowest cost per bit/byte/year will be bought. the NAND could be made from sheep's dung for all the Bean Counters care.
SanX - Thursday, July 25, 2024 - link
DWPD is good that it does not depend on capacity and immediately tells you about how many P/E cycles each cell sustain. 1 DWPD means for example 1825 cycles if warranty period is 5 years (365*5)SanX - Thursday, July 25, 2024 - link
Question is - does 3 DWPD mean some new 10x better than typical technology for TLC or the company hired some superbright flashlight or unseen capacity lithium batteries sellers from eBay to run marketing department?Santoval - Friday, July 26, 2024 - link
No, the flash in both series is identical (232-L TLC), as are the controllers.Note that the MAX series has a much lower (usable) capacity.
That's flash over-provisioning to make them reach 3DWPD.
The fattest model had 5+ TB of flash trimmed, to use as a spare for destroyed cells replacement. So the flash is nothing special; the SSDs simply trade lower capacity for higher endurance.
back2future - Sunday, July 28, 2024 - link
[ it's exactly 16.67% lower capacity for all sizes from above numbers ]FunBunny2 - Tuesday, July 30, 2024 - link
"So the flash is nothing special; the SSDs simply trade lower capacity for higher endurance."but, but... weren't we promised that this new fangled 3D TLC/QLC NAND would last LONGER than olde fashioned planar NAND because it would be fabricated on legacy XXnm nodes?? did they fib?
CiccioB - Saturday, July 27, 2024 - link
Well, not, it is does not tell you anything immediately, because that value depends on the time frame you consider as valid.To know how good is that value, you have to know the warranty period.
The absolute quantity of minimum guaranteed writable data instead does not depends on time.
You know you can write N TB of data before a cell retention capacity may be compromised. Doesn't matter when and for how long.
ZeDestructor - Sunday, July 28, 2024 - link
5 years is the standard warranty duration across tiers and for the mainstream consumer and server markets. Industrial and embedded flash can be longer, but those are quite rare, and specced both ways.On balance, I find DWPD is a much nicer spec too parse than TBW/PBW, especially when looking at drives with wildly disparate capacities (like the S3610 for example, where the smallest is 128GB, and the largest a nice 1.6TB).