Product specifications

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However, knowing which hardware to use is complicated because
each storage expander could be installed inside an MRS enclosure,
which also contains MediaDrives. An MRS enclosure that includes a
storage expander can also be connected to an enclosure that contains
only drives.
See ÒConnecting MRS Enclosures with Storage ExpandersÓ on
page 154 for procedures.
Multichannel Storage Configurations
Multichannel AirPlay MP systems include buffer storage drives
connected directly to each channel and a central shared library of
storage drives linked to all the channels via a SCSI network.