What are these drives and what are they used for? I'm looking into upgrading my motherboard and don't know if I'll need all of those drives then.
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As Ramhound noted, WINRE_DRV is a partition for Windows Recovery Environment.
I suspect PBR_DRV is a partition associated with the Lenovo One-Key Recovery software. It may be other vendors also supply something based on the same third-party software.
Both of these are probably relatively small partitions that are normally hidden from end-users. You should probably leave them alone unless you have, and know how to use, a full set of DVD/CD media to reinstall your operating system, drivers and vendor-supplied utilities.
Neither of these need "optimization" or defragmenting.
RedGrittyBrick
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