Howdy. So I'm in the process of building a new pool for my NAS. I have eight 18tb drives that I've burnin with [Spearfoot's ](https://github.com/Spearfoot) [**disk-burnin-and-testing**](https://github.com/Spearfoot/disk-burnin-and-testing) script from GitHub. Everything has been going smooth so far at 65 hours in. I do have one possible issue however, one of the drives is testing at a slower rate then the others. ​ |90.82% done, 65:24:36 elapsed. (0/0/0 errors)|95.90% done, 65:24:51 elapsed. (0/0/0 errors)|88.11% done, 65:24:43 elapsed. (0/0/0 errors)|53.61% done, 65:24:35 elapsed. (0/0/0 errors)| |:-|:-|:-|:-| |88.58% done, 65:24:38 elapsed. (0/0/0 errors)|89.32% done, 65:24:49 elapsed. (0/0/0 errors)|88.89% done, 65:24:46 elapsed. (0/0/0 errors)|94.82% done, 65:24:37 elapsed. (0/0/0 errors)| ​ So these look good so far, the majority of the drives which are chugging along within + or - 5% of one another. While that top right drive that has fallen behind and is now -40% behind its peers and it continues to slowly fall away from the pack. So my question is does this drive have an issue where its running at a slower speed to its peers or is this nothing to worry about? Once the burnin has finished I was thinking I would speed test each drive and see if anything shows up. Any ideas or comments? Thanks all.