Interestingly, they are for the disks in the same disk bays, 7 & 8 of each unit. The first pair of notifications, 1 for 1 and the other for 3 reconnects (2 out of 8 disks), was received 14 months ago and the second pair about 9 months ago for 1 and 9 reconencts. Synology makes no guarantees for results generated with this tool.Hey, I've seen lots of comments on this saying 'your drive is failing, replace it', however, I have received 2 notifications of this from one NAS and 2 notifications from a second NAS, both are DS1813+ with a runtime of about 34,000 & 60,000 hours on the disks. However, since Synology DSM is using binary prefix as calculation base, the conversion error might exist without further clarification.) and should be checked with a certified Synology sales or support representative. Results from RAID Calculator should be used as a reference only (here we use the decimal prefix for the calculation of disk-array capacity.Always check and refer to the HDD/SSD compatibility list for the latest information. Some models or configurations may not support a certain capacity drive but will be able to achieve the total capacity through other combinations or when paired with an expansion unit. Synology RAID Calculator makes recommendations based on the total capacity picked.To find out more, please refer to Why does my Synology NAS have a single volume size limitation of 16, 108, or 200 TB? Some models can support larger single volume capacities after upgrading the installed memory capacity. In cases where you are over the limit, you may create multiple volumes or designate a drive as a hot spare. Models listed under "Other models" support the selected number of drives and their capacities but may have limitations on how large you can create a single volume.If you're going to expand an existing volume, please read Expand Volumes or Disk Groups by Adding Hard Disks and Expand Volumes or Disk Groups by Replacing Hard Disks for detailed information. The result of calculation helps you evaluate the available space when you are creating a new volume only.On the contrary, Unused space under other RAID types indicates the space that can't be utilized and is thus wasted. When using SHR or SHR-2 HDD protection as your RAID type, the Unused space will be automatically reserved for future expansion.Please refer to the specifications of each model for detailed information. RAID F1 and SHR are only available on selected models.Please refer to Synology Storage Manager for precise data calculations for storage installed on your Synology NAS. The actual HDD size will be affected by the system partition and can vary between vendors, so the values calculated may differ from the actual results. Synology RAID Calculator offers you an estimate on the space utilization with various mixed HDD configurations and RAID types.Visit here for more information on choosing the correct HDD for your Synology NAS.
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