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This class is used in the AHCI code to handle a big request of read/write to the disk. If we happen to encounter such request, we will get the needed amount of physical pages from the already-allocated physical pages in AHCIPort, and with that we will create a ScatterList that will create a Region that maps all of these pages in a contiguous virtual memory range. Then, we could easily copy to/from this range, before and after calling the operation on the StorageDevice as needed with read or write operations.