MacBook fan running high most of the time after HDD/Hard-drive Upgrade

Hi guys,
I've just recently upgraded my MacBook white's (MacBook5,2, 2GHZ duo core, 4GB ram) stock harddrive to a WD 2.5" black 750GB. After which, I noticed my macbook fan running at high speeds majority of the time... Even when just doing light weight stuff on it, such as surfing the net using Safari or even just leaving my computer idle after startup.
I did a clean install twice, the second was too see if it was really just a badly installed OS, but the problem still persisted, well at least till I decided to come here to type the post =P (maybe my macbook's scared about being talked about). Do note, that I did a pc migration each time.
After the upgrade, My fan usually runs at about 5000-6200 rpm, but right now as I'm typing this post, its surprisingly alot lower then what I've been experiencing. About 3000rpm-4000rpm.
As for the harddrive temperature, I noticed it runs between the 37 degree to 40 degree celsius range, so I'm guessing the hard-drive temperature sensor isn't busted, which was the problem for others from what I've read from other discussions here.
Also, when I boot my windows partition, the fan doesn't go as crazy, but it eventually will too.
Any idea what the problem could be? =s Or could it be that my MacBook can't handel 7200rpm hard drives =/ If so I'd probably downgrade to a 1TB WD blue =s
On top of that, does any one know if the 2.5" WD blue are as reliable as the 2.5" WD blacks? As I'm heistant to downgrade as I've read that the blues have a higher failure rate, and wouldn't want that happening. Oh and I'm not considering an SSD for this particular MacBook at the moment, as I may upgrade in another two years or so!
Thank you!
Edwin

Hey Mende1,
Well I guess I'll try returning the drive at the end of this week then my fan seemed to have slowed down abit since the upgrade, it's sorta spinning around 3000rpm now. I'm not sure if it's gonna be the same thoughout, and I'm pretty sure it doesn't spin as much as it did when I had my old HDD on. So I'm giving it a few more day probably till the end of this week. And if the noise issue still surfaces I'll try a different hard drive! and update you on the results!
Thanks alot Mende1!
And hello there rauldoppler!
Well, firstly, I'm using a early 2009 MacBook white! The pre-unibody one. It's running on a 2GHz Intel Core 2 Duo processor with 4GB for ram.
As for the hard-drives, I'd actually reccommend you to upgrade to an Solid State Drive if you can afford it, but if you're like me who needs more memory space then boot speed etc, I guess a HDD will be fine =) As for which brand of hard-drives, I would actually recommend WD (their black drives especially, 5 year warranty, 7200rpm speed hehe), but right now I'm having the fan problems, so I'm not too sure anymore.
I did however, do quite abit of digging around on the net and concluded that WD was a better choices amoungst the rest... But yeah the fan issue is still something I didn't expect. All in all, I guess as for which drive is better, it really depends on your needs or wants, if it's for casual internet surfing and stuff, a WD blue HDD would be fine, or a black if you want a slightly faster boot speed etc at the expense of your battery life and all. If you however value blazing fast boot times and application start up times, go for an SSD. If you need the memory space more then anything then I'd say go for a HDD again too, as it's cheaper interms of gigabite to dollar ratio. (for example, the older 500GB version of my new WD black would cost USD $43, while a Samsung 500GB SSD Pro would cost $349) Also, You could do abit of reading up on SSDs if you're interested in it There's alot of plus points to it, like ALOT, and if the price tag wasn't so huge, I would have used it for my macbook already!
Lastly, I used a WD Black 750GB for my macbook upgrade. However, I'm gonna downgrade to a WD blue 1TB this weekend if the fan doesn't settle down over time Cause well, the fan noise is really an issue for me.
Peace out guys!
Edwin

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