Caching an HDD (hard disk drive) from an SSD (solid-state drive) is a process of using the SSD as a temporary storage location to speed up the access to frequently accessed data on the HDD. This process is also known as hybrid storage or tiered storage.

In this setup, the SSD acts as a cache for the HDD, storing frequently accessed data and speeding up the overall performance of the system. The SSD cache can be either a separate physical drive or a partition on the same drive as the operating system.

When the system requests data from the HDD, the cache first checks if the data is already present in the SSD cache. If the data is present, it is immediately retrieved from the cache, resulting in faster access times. If the data is not present in the cache, it is retrieved from the slower HDD and then stored in the cache for future use.

Caching HDD from SSD can be achieved through various software and hardware solutions, including Intel Smart Response Technology, AMD StoreMI, and various third-party caching software solutions. The effectiveness of caching depends on various factors such as the size of the SSD cache, the type of data being cached, and the usage patterns of the system.

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