The technology and cost barrier of the SSD motivated many research groups and companies to merge the SSD with low cost and large capacity storage device, Hard Disk Drive (HDD). Exploiting the SSD as a cache disk for the HDD not only reduces overall power consumption but also enhances responsiveness of a system. Four different cache management solutions are reviewed and validated advertised benchmark score. We also define a term, budget, to measure the maintenance cost of the cache managers. We show that HyperDuo is better that other device in terms of the budget.
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