takeshi7 :
This is a huge advance over the HDD, and could necessitate throttling of the SSD to keep it within the expected warrantied workload of 3 DWPD. With the capacity of new SSDs touching 2TB, this can provide up to 6 TB of useable endurance per day for the SSD, in comparison to the lowly 148-296 GB attainable by today's fastest HDDs.
I don't know where you got that figure saying the fastest HDDs can only do 148-296 GB per day. The Seagate SkyHawk is rated for around 500 GB/day (180 TB/year), and I'm sure in reality the amount of writes the drive can handle is much higher since it doesn't have to wear level any flash. Paul, you should actually test this instead of just talking a bunch of nonsense about it.
source:
http://www.seagate.com/www-content/product-content/skyhawk/files/skyhawk-ds-1902-3-1608us.pdf
For sequential data, yes, HDDs can write more data per day. However, we are discussing a competition between SSDs and HDDs - and data centers buy SSDs for perforamance-oriented workloads, ie, random data. HDDs cannot write that much random data per day by any measure, even if you multiply its performance by a factor of ten.
Testing? Here is the current state of HDD performance with the leading 15K HDDs (which are the fastest). This includes every relevant drive on the market. I've tested them for years, so you can google and find many many more articles over the years. This is the most current state of the market. (though I do have ten of the new 15k.6 Seagate drives in the lab, and will provide an update to this test pool shortly.)
http://www.tomsitpro.com/articles/hgst-ultrastar-c15k600-hdd,2-906-4.html
For SSDs, here is the current state of the SATA SSD market, which is also a segment I have tested for years. Also, bear in mind these are SATA SSDs that are on the low end of both endurance and performance, and they still beat HDDs handily in the amount of usable performance they provide.
http://www.tomsitpro.com/articles/intel-dc-s3610-800gb-enterprise-ssd,2-924-3.html
As to sequential data, if you feel the need to work out the math, you will find a very similar situation.
So, yes, this is based upon actual testing. The rest is just math. Perhaps I should note that SSD vendors have used this same line of reasoning for years when selling SSDs, but those years began after my 2013 article