I can only comment on what I've experienced, and like anything it will give you results based on your particular set-up and environment.
My findings with Seagate IV & V hdds seem confirm sevisehda statements, although it must be noted my system is entirely fanless with all major heat producing items water cooled, & I run cooler coolant than most people.
Even cooling just the hdd's cover plate only through the sticker is enough to have cool to the touch drives all over, and internal sensor reported temps of around 28C, (compared to 58C max I got in a test I did recently with no waterblock). It may not be important to the drive to have it cooler that 58C but I don't want anything adding hot air to the case insides either. I also found an 80mm fan at 5v was enough to keep the drives cooler (under 40C)
I did original intend to mount the drives to the block using a copper side plate which would also help sink the heat to the block from this sides, and may still do this, however it appears not to be a requirement with the drives, block and coolant temps I'm using.
Maybe with hotter high speed scsi drives it could be more important to pay particular attention to the block design and contact area.
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