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That's pretty high if it's your idle temps. Do you currently have any airflow over the drive?
My drives usually sit around mid 30's while idling and low 40's while actually being used with decent airflow over them.
Try to see if you can point a fan directly at it to see if the temps go down.
I think i have some extra fans i could try to mount somewhere for my case, thanks just wanted to see what some other people had for their temps on their caviar blacks, i know they ran faster just wasn't sure if they were hotter or not
My Black drive (an older 1TB version) runs hotter than the rest of the drives in my system, I wouldn't worry too much about 52C (126F) , especially if it's Summer and your ambient temps are higher in your house.
According to the specs, 52C is within the 0-60C operating range. (Page 2)
http://www.wdc.com/wdproducts/library/SpecSheet/ENG/2879-701276.pdf