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Comment by userbinator | Hacker News Reader

...and if you actually want to buy one,

https://www.digikey.com/product-detail/en/micron-technology-...

But it's TLC flash (more correctly known as 3-bit-per-cell), which has exponentially lower endurance and retention than 2-bit(MLC) or 1-bit(SLC) despite only multiplicatively higher capacity. This particular model has an endurance of <1500 cycles, and that's probably even after a considerable number of blocks have been remapped. The odd capacity of 11TB is another giveaway, since TLC NAND raw capacity is usually in multiples of 3.

No mention of retention either in the datasheet, which is a bit worrying.

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Honestly, you can write ~15,000+TB and writes are limited to 2.5GB / s. Don't forget you get as many reads as you want so that seems like a non issue for the most part.

PS: Another way of looking at this is if you write logs that you keep for 48 hours that's 6 years assuming you fill it up every time.

You don't actually get as many reads as you want. Reads disturb the cells and you eventually have to rewrite them based on reads as well.

To short-circuit a click, that's $7,700.515 each if you're willing to go in with someone to buy four at once for $30,802.06

$0.70 a gig is really high. Even for cutting edge high density SSDs, I would expect to see around $0.50 a gig.

Samsung's consumer PCIe drives are $0.47 and $0.58 for TLC and MLC respectively. $0.70 for an enterprise SSD isn't as bad as you think; flash is more expensive now that what you might have expected.

You could write like 4TB per day for 10 years there are a lot of workloads that would be OK with this.

The lifetime of most hardware is under 10 years. I'd be pretty happy with an unconditional 5 year warranty.

That said, in five years a 10TB SSD should be around the price of a 1TB SSD now.

Will it? In the past 6 years the price per GB only halved (along with endurance by the way, but its still enough for a lifetime of a normal laptop/PC).

I bought a 512GB Samsung 850 SSD years ago for 150€. The price hasn't changed and the competitors are only slightly cheaper at 140€.

I think NAND has hit a brickwall in scaling. The only thing the manufacturers can do to decrease prices now is to add more layers and store multiple bits per cell at the cost of write cycles.

> The odd capacity of 11TB is another giveaway, since TLC NAND raw capacity is usually in multiples of 3.

Not that often. Most manufacturers have produced TLC-specific parts with power of two nominal capacities. Intel/Micron are the odd ones out with their first-gen 3D NAND being sold as either a 256Gb MLC part or a 384Gb TLC part. For their second generation 3D NAND, they're manufacturing 256Gb and 512Gb TLC parts.

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