The performance specified in the article lists only its sustained transfer rate, with no mention of sustained read speed, sustained write speed, random 4k reads

The performance specified in the article lists only its sustained transfer rate, with no mention of sustained read speed, sustained write speed, random 4k reads, random 4k writes, or any other useful performance metric. The caches are freaking enormous- 512MB. Am I to understand that these are SMB disks? The article does not mention SMB at all, which is surprising to me given WD's recent history.