Low Cost NAS Boxes and Performance over Time

Servethehome.com has an interesting post about the speed differences in NAS devices over time. It seems that as the NAS drives fill up, the speed degrades:
First, the data was being written to the inner parts of the drive platters. On modern disks, it is not uncommon to see a drive go from 130MB/s or more at the outer edge to half of that at the disks inner edge. The disks in the production system were filling the last portions of the disks so the per-drive performance was probably closer to

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