i wrote a tutorial about rejuvenation it increases throughput of any written drive. Just used it on my MyBook 8TB External. Although marginal, it increased the drives gain and i got a slightly faster throughput. Also, I deliberately did away with NTFS for exfat and transferred its plot from an internal pc drive using a 3rd party copying application to prevent fragmentation by using a large memory buffer adjustable in the app. NTFS can be a bottleneck on external disks is why exfat was invented. A fusebundle is available for linux to read them too.