Understanding the Role of Cache Size in HDD Performance: A Buying Guide

A cache or cache is a data buffer on the path between the disc's discs and the rest of the electronics in which the data is temporarily stored. The time to access data in the cache is much shorter than accessing the same data on the disk on the hard disk. So the more cache size, the more data you can store in it, which your computer will have faster access to.
This is a brief description of the theory, and as in theory ... a larger cache should translate into performance but for home use (one disk) the difference between 32MB and 64MB will be imperceptible to you. Then you have about 5MB / s better transfer at 64MB in relation to 32.
The situation changes dramatically when you already have two disks, for example, inserted as RAID0 then larger cache and the same configuration translates into an increase of about 45MB / s in favor of 64 in relation to the identical configuration with a 32MB cache.