Blu-ray read speed is 6x (216Mb) vs. SATA III hard drive @ 5400RPM (125Mb)
You are confusing your bits and bytes. 6x BD is indeed 216Mb/sec (megabits) but there are 8 bits to a byte so this is 27MB/sec (megabytes). A 2.5" 5400rpm drive, as said in another post, is going to be around 85MB/sec which is 680Mbit/sec. A hard drive is significantly faster than BD and even if the raw transfer rate was to be close at all, the seek times are not.