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The model is especially flawed if disk performance and utilization improves. When measured at the cost for bandwidth in $/GB/s, some consumer SSDs can get as low as $550/GB/s, but the average is between $1,000/GB/s and $1,750/GB/s.
Table1: Consumer SSD, Enterprise SSD, and HDD Comparison
*C – SSD devices are consumer SSDs, E – SSD devices are enterprise SSDs. Enterprise SSDs are colored for reference.
**All data and information was collected from manufacturer or product datasheets and publications.
Table2: Consumer SSD, Enterprise SSD, and HDD Comparison
*Prices were collected from vendor information and product prices from third party vendors and reviews. Storage and power data was collected from vendor and product datasheets and marketing papers.
**$/GB, $/GB/s, W/GB, and W/GB/s were developed based on information already available for products in this table and the previous table.
Enterprise SSDs are entirely different as the cheapest enterprise SSD had a cost of $1,303/GB/s and the average ranged from $3,200/GB/s to $4,200/GB/s. By comparison, Seagate’s Terascale 4TB HHD has a bandwidth cost of $1,438/GB/s and the Enterprise 15K 2.5” HDD has a bandwidth of about $1,000/GB/s. It is necessary to note that “bandwidth” for SSDs was measured using sequential read data, which is almost universally the best performance figure for SSDs, while HHD bandwidth was measured using average read/write times from the disk, not necessarily best performance data. As a result, real $/GB/s are probably higher for SSDs depending on the read/write workload, and will always increase with greater write workloads. As a result, SSDs do not necessarily provide an advantage or cost reduction when costs are measured in bandwidth, or $/GB/s, especially if dealing with enterprise SSDs or write-heavy workloads where wear-leveling overhead can significant increase the cost of the device to meet long term reliability requirements.
Table 3--Enterprise Hard Drive Comparison
Table 4--Enterprise Hard Drive Comparison
*Performance numbers based on average sequential read and write rates from product datasheets.
** $/GB, $/GB/s, W/GB, and W/GB/s were developed based on information already available for products in this table and the previous table.