Why is the Crucial/Micron M500 rated at 72TB total writes for all models?

[Viper GTS]

Is the underlying NAND not the limiting factor here? Or are they just being lazy and not giving real data? It doesn't seem to have any relation whatsoever to the 3,000 program/erase cycles they're claiming on their 20nm NAND.

I have an application that could benefit from the random performance of an SSD and I was hoping with normal program/erase cycle based lifespan expectancy that the 960 GB would last years under my workload (about 6-8 MB/s writes continuously) but if 72TB is the real life expectancy I'll burn them out far too quickly to make the cost feasible.

Viper GTS

 

[Hellhammer]

It's a warranty thing, not NAND related. Higher rating requires more validation which obviously drives up cost. The actual NAND should be good for more writes, especially at the higher capacities, but it's no longer covered by warranty after reaching 72TB of writes.

 

[Viper GTS]

So my quick math assuming 10 MB/s write per drive and 3000 P/E with WA of 1 (just for the sake of simplicity) yields around 3333 days or 9 years. If my WA is closer to 3 then I'd still likely get 3 years of use which would be enough for my needs.

The unfortunate part is I'd be killing the warranty in about 4 months for each drive, and at 500 of them if they turn out to die in droves between 4 months and 3 years that would be expensive.

Shame.

Viper GTS

 

[Smoblikat]

So my quick math assuming 10 MB/s write per drive and 3000 P/E with WA of 1 (just for the sake of simplicity) yields around 3333 days or 9 years. If my WA is closer to 3 then I'd still likely get 3 years of use which would be enough for my needs.

The unfortunate part is I'd be killing the warranty in about 4 months for each drive, and at 500 of them if they turn out to die in droves between 4 months and 3 years that would be expensive.

Shame.

Viper GTS

500...................as in..........500 960gb SSD's? Dear god PLEASE RAID0 them.............

 

[RU482]

I tested the M4 and more recently the M500 using Anvil Disk Utility endurance tests With both generations, I was able to exceed the 72TB write spec . The M500 got to around 100TB, the M4 went beyond 150TB.

I tested some SanDisk X100s 64GB drives that made it past 300TB writes before starting to have problems!

 

[philipma1957]

So my quick math assuming 10 MB/s write per drive and 3000 P/E with WA of 1 (just for the sake of simplicity) yields around 3333 days or 9 years. If my WA is closer to 3 then I'd still likely get 3 years of use which would be enough for my needs.

The unfortunate part is I'd be killing the warranty in about 4 months for each drive, and at 500 of them if they turn out to die in droves between 4 months and 3 years that would be expensive.

Shame.

Viper GTS

Now you know how they can sell the 960gb ssd for 600. many users will kill the warranty off in a year or less. Logically it should be 8x that of the smaller 120gb ssd this would be 8 x 72 or 576TB > I write 300Gb a week or 16Tb a year to my 960gb unit I should get to 50 Tb in 3 years and be okay. the fifth year I would need to worry.

you would exceed it in about 32 months not 4. So by the under specced warranty you lose 28 months of coverage whic is worth about 150 usd so the ssd should sell at 750 not 600 and over the higher use warranty.

 

[tweakboy]

That is enough for 10 years. lol