Some New Hard Drives Have Less Endurance Than SSDs

upstart writes:

Some New Hard Drives Have Less Endurance Than SSDs:

Modern magnetic recording media, the building block of HDDs, has higher durability than most modern NAND flash memory used in SSDs. However, controversial workload ratings imposed by HDD makers to diversify their product portfolio make the latest NAS-bound hard drives less reliable than even cheap SSDs, much less the best SSDs on the market.

There are several breeds of HDDs available today: enterprise-grade drives rated for a 550TB workload per year, enterprise NAS-grade drives rated for a 300TB workload per year, and desktop PC drives rated for 180TB per year or so. Solid-state drives do not have per-year workload ratings but feature terabytes to be written (TBW) and drive writes per day (DWPD) endurance ratings that you can use to calculate the total endurance.

WD Gold 20TB HDD	550 TB	2,750 TB
WD Red Pro 20TB HDD	300 TB	1,500 TB
WD_Black SN850 2TB SSD	240 TB	1,200 TB
WD Red SA500 4TB SSD	500 TB	2,500TB
Ultrastar DC SN840 6.4TB	7,000 TB	35,000 TB

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