QNAP Flexible Storage Architecture
QNAP
flexible storage architecture consists of three layers, which combine to offer storage
flexibility and data protection.
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Disks
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Storage pools
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Shared folders and LUNs

Tip:
You can expand the storage capacity of your NAS by connecting a QNAP expansion unit. For details on compatible models, see www.qnap.com/compatibility or your NAS hardware user guide.