Synology NAS devices are produced without disk drives. It is not a disadvantage – you can buy any needed hard disk drives and install them to your NAS.
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The DS923+ 4-Bay NAS Enclosure from Synology is a capable solution that can be adjusted and expanded as your needs change, with faster networking, and
Synology DiskStation DS923+ 4-Bay NAS Enclosure - 4 x 3.5 or 2.5 SATA HDD/SSD, 2 x M.2 NVMe SSD Slots, 16GB DDR4 RAM, AMD Ryzen R1600 Dual-Core up to
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