Legacy Products
The resources associated with these products have ceased their development and are no longer supported.
D-Link Systems, Inc. recommends retiring these products and replacing them with products that receive firmware updates.
If I connect two USB hard drives, how is the storage configured? (mirrored or one single logical drive)

The DNR-202L supports standard hard drive configuration that provides a single volume for each drive. It doesn’t support JBOD or RAID configuration.