3 ms·

No, you're wrong. The 850 PRO uses MLC while the EVO uses TLC. But given that they're both constructed on Samsung's 3D-VNAND technology, their endurance is stil

No, you're wrong. The 850 PRO uses MLC while the EVO uses TLC. But given that they're both constructed on Samsung's 3D-VNAND technology, their endurance is still much higher than the competitors out there.

acqq 10y ago
> their endurance is still much higher It's not "much" higher, actually, 3D MLC as implemented by Samsung is just "up to twice" better than the planar MLC given the same die area and capacity: http://www.samsung.com/semiconductor/minisite/ssd/v-nand/technology.html http://www.samsung.com/semiconductor/minisite/ssd/v-nand/tec... "Samsung V-NAND provides up to twice the endurance of planar NAND." But if the size of the cell drops, the number of P/E cycles drops. Samsung's endurance declarations are real and to be believed, they initially used bigger cells than some of their other chips (or competitors), but Samsung engineers know what they do, that "some tests" achieved "much more" can be either an accident or due to the errors in the test methodology (and I very much suspect the later, because it also allows the accidents to be taken as the "success"). At the time these SSDs appeared, Samsung declared twice less TBW than they do now, so now the declared endurance is surely not too pessimistic, but based on the real knowledge of what's inside.
Reason077 10y ago
Yes, you're right. But I don't expect an EVO to last for a full 7 PB of writes like the PRO did. But even if it lasts a fraction of that (say, approx 1 PB, which previous generation 840 EVO was able to achieve) then it's still 90 years of life at current usage levels! A (1 TB) 850 PRO would last over 600 years! In all likelihood the drive will never get anywhere near any of these values - it'll be replaced with newer, better tech at some point. It may then get used for a backups or secondary storage, but in those scenarios the daily writes will drop enormously.

acqq 10y ago

> their endurance is still much higher It's not "much" higher, actually, 3D MLC as implemented by Samsung is just "up to twice" better than the planar MLC given the same die area and capacity: http://www.samsung.com/semiconductor/minisite/ssd/v-nand/technology.html http://www.samsung.com/semiconductor/minisite/ssd/v-nand/tec... "Samsung V-NAND provides up to twice the endurance of planar NAND." But if the size of the cell drops, the number of P/E cycles drops. Samsung's endurance declarations are real and to be believed, they initially used bigger cells than some of their other chips (or competitors), but Samsung engineers know what they do, that "some tests" achieved "much more" can be either an accident or due to the errors in the test methodology (and I very much suspect the later, because it also allows the accidents to be taken as the "success"). At the time these SSDs appeared, Samsung declared twice less TBW than they do now, so now the declared endurance is surely not too pessimistic, but based on the real knowledge of what's inside.

Reason077 10y ago

Yes, you're right. But I don't expect an EVO to last for a full 7 PB of writes like the PRO did. But even if it lasts a fraction of that (say, approx 1 PB, which previous generation 840 EVO was able to achieve) then it's still 90 years of life at current usage levels! A (1 TB) 850 PRO would last over 600 years! In all likelihood the drive will never get anywhere near any of these values - it'll be replaced with newer, better tech at some point. It may then get used for a backups or secondary storage, but in those scenarios the daily writes will drop enormously.