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if this can be done please let me know how.

If you have a MacBook model with an internal optical drive, you can replace the optical drive with a bracket like this that holds a second internal drive. If you search the forums for "data doubler" you will find tons of posts from others that have done this.
 
Model Identifier: MacBookPro9,2

Yes, you can replace the optical drive with a HDD or SSD. You can also search the forum for threads on "optibay". You'll find dozens of threads, including instructions on how to do it.
 
thanks cause I can't find any internal hard drive that is 2.5 inch and is 2tb
 
which one is a better pick the owc or the mce? I own a external blu ray player that reads dvd's will I still be able to use idvd?
 
Why isn't we can't put in a 3.5 inch hard drive are their converters for this? I did google it nothing.
 
bummer so out of the two companies owc and mce what is a better brand?

To be honest it is personal preference, go with your gut feeling. They will both perform just as well and are fairly easy to install.

When I did this I simply picked up a cheap enclosure of Amazon for 20$ and a HD of the shelf.
 
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