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You posted the same links.

If your MBP is 2012, then this drive should be fine. However, expect about 140 MB/sec max.
 
Ok I changed the first link to a different one (Toshiba from same site, Best Buy).

Mine is 2010 (early) version.
 
Based on the ratings alone I would get the WD. There's only a $20 difference. However, if the Toshiba was $99 and the WD $150, I would definitely get the Toshiba.

Both of these companies make their own drives. WD has more experience. Toshiba is good too.
 
I don't know what this has to do with Mac Pro

But in any case, I'd get the Seagate. I know you didn't link to it, but you can change interfaces with the Seagate to Firewire or even Thunderbolt.
 
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I see. Is 2TB the biggest that can fit?

No, as even 2.5" HDDs with 2 TB capacity are 15 mm high and you can only use HDDs or SSDs with a maximum height of 12.5 mm.

MacBook, MacBook Pro: Replacing the Hard Disk Drive, transferring data to the new HDD

the guide includes:
  • 0. Identify your MacBook or MacBook Pro
  • 1. Getting a new HDD
  • 2. Guides to replace the internal HDD with a newer one
  • 3. Transferring data from the old HDD to the new HDD
  • 4. Using the optical disk drive (ODD) slot for placing an SSD or HDD inside the MB/P (OPTIBAY)
 
Would it fit inside most windows laptop that aren't purposely thin?
 
Would it fit inside most windows laptop that aren't purposely thin?

No. You have to research the actual models of Dell, HP, Asus, Samsung, Acer and Sony models, if they accept such big drives, as those companies have put quite a lot of effort making their machines thinner.

You could always get two 1 TB HDDs in 2.5" size and put them in via Optibay solution (see • 4 in HDD guide).
 
Everyone will have different opinions abut MFG's based on their experience. I myself love the new Seagate Go-Flex drives and always had good luck with Seagate, and not so much with Western Digital, however it is only my personal preference. Also Seagate makes an adapter for Thunderbolt, so no matter what Go Flex drive you have they, have an adapter for it, so quite flexible if you ask me.
 
For that computer, you want something that supports firewire 800 for the best speeds.
 
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