Question Can I dedicate a portion of system memory to a disk as a cache?

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May 17, 2015
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There are times I copy large amounts of data (1 - 6TB with 80K+/- files) between conventional hard drives. The copy goes really fast for a couple of seconds until the disk cache is depleted (I think) then moves slowly until the operation is complete. Is it possible to dedicate a portion of system memory (1-4 GB I have 32GB system RAM) as an extended cache to facilitate the data transfer? Or is the receiving disk the bottle neck and dedicating RAM to cache, even if possible, would not result in faster transfer times?

FYI...one of the drives is a NAS formatted for standard drive use, if that makes a difference to any of the answers.

Thanks