Metadata.db is the only thing in a Library that gets read on a regular basis.
Mine has made it to 50M. The number of extra columns (fields) and the length of the comments will affect the size. Covers are NOT embedded in the DB for the same type of reason. It would make it big and clunky.
A Good (no need for a 10K either) spinning drive. Internal mounted is best, but a USB 3 is next best and a USB 2 is fine.
As Stumped said, the only time you need high drive bandwidth, is a full copy.
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