Hi, I bought Unraid years ago but haven't used it until now. I now have a lot of different hard drives lying around and wanted to start using them with Unraid. I had to create a new installation USB drive because there were issues with the old one. The parity sync ran at about 20 MB/s. I have now created a new USB drive. Unfortunately, I ran into problems during the creation process. It didn’t work with the default tool. I then used Rufus and Debian to create a USB drive and copied the UNRAID files from the ZIP file onto it. That way, I was at least able to get a bootable USB drive. With this new USB drive, I was able to set up my new array, and the parity sync also completed at about 120 MB/s. So I thought the speed issue was now resolved. Since I had already filled the disks with the “old” stick initially, there was already various data on the hard drives. I’ve now started an rsync process to copy the missing data. That worked well at first, until the cache was full and the data had to be written to the array. Now I’m back down to a write speed of about 20 MB/s on the array. Does anyone have any idea what the problem might be? I’m ruling out a communication issue with the controller, since the parity sync ran quite smoothly at 120 MB/s. I know that one or two of the drives have a SMART error. However, I don't think these errors are what's slowing down the array. I'd appreciate any advice. unraid-diagnostics-20260320-1339.zip