What are uexp and ubulk files?

I can’t understand this “Rather than one large asset, these allow us to write an asset’s bulk data (.ubulk) and exports (uexp) out into separate files. This system improves perf in certain circumstances where file read contiguity is lost due to the large size of assets. This feature avoids this by enabling the reader to skip over an asset’s bulk data when seeking to the next file in a series without having to actually have serialized and seeked past that data (since it’s in separate file).”.

Can you explain me more? Is this about disk seek time?

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