Network-attached storage devices can have up to 8 bays, sometimes more if they come in blade form factor, but that much is ultimately unnecessary for home and small offices.
One or two bays are enough if the drive capacity support is large enough. In the case of Synology's two latest models, the top storage capacity for each drive is 6 TB.
That means that the top capacities for the new DS215j and DS115 are of 6 TB and 12 TB, respectively. A bit less when RAID mode is activated.
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