1. A data storage device with rotating magnetic storage media having a first storage zone and a shingled magnetic recording (SMR) zone, the data storage device comprising: a storage control system configured to: maintain file system metadata in a metadata location of the first storage zone for user data that is stored in the SMR zone; responsive to a usage condition being satisfied for the file system metadata in the metadata location: identify one or more metadata locations in the SMR zone to redirect storage of at least a subset of the file system metadata; and store at least the subset of the file system metadata in the one or more metadata locations in the SMR zone; and maintain an indirection data structure in the metadata location of the first zone that correlates the one or more metadata locations in the SMR zone to the file system metadata.