Is this compatible with my Mac Book Pro Mid 2009 laptop?

I installed the first generation Samsung in my Mid 2009 laptop, it was no problem for me. If you are comfortable using a screwdriver on your laptop, "ifixit" has excellent step by step instructions to help you with the install. It takes me about 30 minutes, going at a slow speed, from start to finish to install the SSD, not counting the software install. You may want to have a can of compressed air handy, when you take the bottom apart, you will want to take your computer outside and blow off the accumulated dust on the components, just don't get any closer than about 6 inches with the source of the compressed air. For the record, I never installed a "trim enabler" and would advise that you do not install one, there is bit of controversy about using a third party trim enabler with Yosemite. My understanding is that Samsung has a built in trim enabler, you do not need to activate it, it's done automatically.

I have a HP Pavilion with a 1TB hard drive. I onlly use 120 to 130 GB. Can I replace it with the 500 GB SSD PRO? Or do I need to go with a 1TB SSS?

If the reason you are making the change from the 1TB drive is to go to solid state, you should have no problem making the change to the 500 GB SSD. I bought the 500 SSD to hold only my operating system and the files that go with the default C drive. All programs and other files go to a different drive or drives. Hope this helps.

i don't understand why the 830 series cost more than the 840 pro, this one seems faster. what am i not getting?

Greetings Joe, from the research I have done, it seems that the 840pro is better than the 830 which is better than the 840. The 840 uses cheaper memory technology than the 830 and 840pro which limits its write endurance over its lifetime.To answer your question about why the 830 is more expensive than the 840pro. My first hypothesis is that supply for the 840pro is much greater than the 830. Amazon will have to lower the price of that product if they want to keep people from buying it at other stores. I also noticed that many of the reviews for the 830 were from customers replacing hard drives on their Macbooks. If they were recommended that drive by a friend and saw the good reviews, they may or may not check similar products. At that point they are in the same boat as you, wondering why the ssd that looks better in specs is cheaper. In the end if they are on the fence, they probably value the advice and judgment of someone they know with similar tech to them rather than going gnashing over what is most efficient.Hope that helped you in making your decision, enjoy the SSD.

Hard Drive	256 GB 256GB
Brand	Samsung Electronics
Series	840 Pro
Item model number	MZ-7PD256BW
Hardware Platform	PC, Mac, Unix, Linux
Item Weight	1.92 ounces
Product Dimensions	3.94 x 2.75 x 0.28 inches
Item Dimensions LxWxH	3.94 x 2.75 x 0.28 inches
Color	Black metallic
Flash Memory Size	256 GB
Hard Drive Interface	Serial ATA-600
Manufacturer	Samsung Electronics
ASIN	B009NB8WRU
Is Discontinued By Manufacturer	No
Date First Available	October 9, 2012

Samsung Electronics 840 Pro Series 2.5-Inch Solid State Drive, 256GB

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