There was no problem to use 18TB Ironwolf HDD in DS1821+. Just warning message. : r/synology
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Seagate IronWolf Pro 18TB HDD and 4TB IronWolf NAS SSDs Arrive
Seagate IronWolf Pro 18TB Review - StorageReview.com
Seagate IronWolf Pro 20TB NAS HDD Review - StorageReview.com
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Seagate IronWolf Pro 18TB HDD and 4TB IronWolf NAS SSDs Arrive
Seagate Updates Ironwolf Pro Line HDD With Up To 18 TB Capacities
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Seagate IronWolf Pro 72 18TB 3.5 Inch SATA 6Gbs 256MB Cache Internal Hard Drive Hard Disks | Sustainable Office Revolution
Review: Seagate Ironwolf Pro 18TB SATA3 Hard Drive (ST18000NE000) | Gough's Tech Zone
Seagate IronWolf Pro, 18 TB, Enterprise NAS Internal HDD –CMR 3.5 Inch, SATA 6 Gb/s, 7,200 RPM, 256 MB Cache for RAID Network Attached Storage, 3 year Rescue Services (ST18000NT001) : Amazon.co.uk: Computers & Accessories