![]() The number of enclosed drives is normally 2 or 4, while the bays are compatible with either the SATA or the M.2 interface.Ĭertain high-end models of QNAP NAS can be combined with an expansion unit. They are characterized by a very low level of noise and great space efficiency. There are also some home QNAP NAS devices with a set-top design. The latter can host multiple expansion devices, providing the possibility for a substantial enlargement of storage capacity. Moreover, their functionality can often be upgraded, for instance, using a SAS expansion card. The drive compatibility is mostly analogous to that of tower units, but some upmarket devices may additionally support SAS drives. They are usually installed into a server rack using special sliding rails. Designed to provide server-grade performance, these appliances also have much higher noise levels. Such models have from 4 to 30 drive bays and can measure 1U-4U in height. The rackmount layout is intended mainly for enterprise usage. Certain models may also feature additional slots that make it possible to install M.2 SSDs. In contrast, all-flash towers may be equipped with 2.5-inch bays alone, that accept SATA or U.2 NVMe SSDs. The standard bay design provides space for 3.5-inch SATA hard and solid-state drives, while 2.5-inch ones can also be mounted using special holes. Such models are compact enough to sit on a desktop and can house from one to as many as 16 drive bays. The tower form-factor is more typical for QNAP NAS employed by households and up to midsize businesses. They range from small single-bay boxes all the way up to massive 30-bay units. QNAP offers a wide selection of NAS devices to meet a whole spectrum of user requirements.
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