Starting in 1996, Alexa Internet has been donating their crawl data to the Internet Archive. Flowing in every day, these data are added to the Wayback Machine after an embargo period.
Starting in 1996, Alexa Internet has been donating their crawl data to the Internet Archive. Flowing in every day, these data are added to the Wayback Machine after an embargo period.
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The Wayback Machine - https://web.archive.org/web/20130828115004/http://lwn.net:80/Articles/428909/
You mention read/write speed around 15 MB/s.
How does that fit together with the number between 150 and 350 MB/s which are listed for SSD drives e.g. on alternate.de ?
Actually I can remember that when writing to raw NAND we had also rates somewhere in the 10 to 15 MB/s range.
Posted Feb 19, 2011 20:03 UTC (Sat) by arnd (subscriber, #8866)
[Link]
15 MB/s is typical for good SD cards (e.g. Class 6), which are limited by design to 20-25 MB/s anyway (UHS-1 SDHC will be faster, but is still rare today). High-end SSDs can be much faster for a number of reasons:
* SATA is a much faster interface than SD/MMC
* NCQ and write caching allows optimizing the accesses by reordering and batching NAND flash accesses
* Using SLC NAND instead of MLC improves raw accesses
* Using multiple NAND chips in parallel gives a better combined throughput
* Expensive microcontrollers on the drive can use smarter algorithms
All of these cost money, so you don't find them on the low end drives that I analyzed.
