Why SSDs won't replace HDDs

– "It's been a period of tremendous evolution for flash, but I believe dark clouds are forming on the horizon," writes consultant Henry Newman in an Enterprise Storage Forum post, "and the reasons have to do with lithography limits and disk drive density."

More excerpts:

"There are limits to how small things can get with current technology. Flash densities are going to have data density growth problems."

"Flash performance for small block I/O (less than 32KB reads) is orders of magnitude faster than disk, but we all know that flash drives are not created equal for writes."

"Flash technology won't achieve the densities of hard drives at anywhere near the same cost, at least anytime soon. Flash and hard drives will have to live together, and if flash vendors do not see that they will risk missing their target market, as cheap bulk storage is needed for most data just as much as small block random I/O is essential for some use cases."

"Hybrid storage requirements are here to stay. Flash addresses the problem for small files, small application I/O requests and swapping far better than hard drives ever will [but] flash will never have the price/density of hard drives."

Read the full article on Enterprise Storage Forum: "Why Solid State Drives Won't Replace Spinning Disk."

SSD-related articles from InfoStor:
Nimbus scales all-flash SSD arrays
Virident ships SLC SSDs for PCIe
Anobit claims MLC SSDs rival SLC SSDs
Violin to acquire Gear6 for caching software

This article was originally published on July 23, 2010