SSD Random Read 4k Aligned

[jawknee530]

I noticed in this article:
http://anandtech.com/show/3656/corsairs-force-ssd-reviewed-sf1200-is-very-good

that there is a chart for 4k aligned random write but none for read. Is there no difference in read between 4k aligned and non aligned? Thanks.

 

[Nothinman]

Well the device will only read/write in 4K pages so the biggest problem an unaligned read should cause is 8K if the data straddles two pages. So there should be some impact, but with high read speeds of SSDs and OS read-ahead the affect should be minimal.

For writes however, if you update some data that straddles 2 pages you have to read both pages, update the data and write both back instead of just 1 step of updating a single page.

Disclaimer: I didn't read the article.