If there are no issues, note the speed of a single disk for later reference, re-create the RAID and test the speed of the RAID again.If yes, replace that disk or remove it from the RAID. unable to complete the formatting process), swap the disks and see if the problem follows a certain disk. If you find a disk that is slower than the others or has problems (e.g. Initialize and create a new volume on each disk.If nothing else has helped so far and you have enough available storage space in another location, backup your data to another drive and then remove the RAID.Fragmented data and less than optimal directory structure after using the RAID for a while can slow down the drive (use DiskWarrior periodically).Certain NAS HDDs using SMR technology might have reduced write performance after 10 minutes of work.SSDs might slow down over time if TRIM is not enabled (sudo trimforce enable).In certain enclosures, the performance of a single disk can be limited to around 370 MB/s.A Thunderbolt 2 enclosure will max out at around 1375 MB/s.A single 3.5" SATA HDD usually runs anywhere between 150-250 MB/s.Check the specifications of your hardware for more details. Speeds can vary depending on the drives, the enclosure and the computer. If that is the case, free up some space and then test the speed again. over 75%), especially for spinning hard disk drives (HDDs), the speed might be slower than with empty drives. If you are using bus power and/or a laptop, make sure to plug in the power adapter to your device and to your laptop.
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