Especially the WUH721816ALE6L0 looks interesting, but I can't find any info on the HD at western digital. For the WD Ultrastar DC HC550 (
https://www.westerndigital.com/de-de/products/internal-drive...) they only list the WUH721816ALE6L4 and WUH721816ALE6L1 which would match the size. Is the L0 correct and how does it differ from L1/L4?