I know that the install CD only works on the original macbook it came with but my question is what hardware is it specific to? Is it the logic board? OR Is it only specific to my laptops model. IE, if I had a 2nd macbook pro from the same time period (same model) and I lost the install CD for that one, could I use my 1st laptops install cd? Also, so I understand if I had a desktop mac instead the CD would not work because it is the original install to my macbook pro. But, if I connect the HD of my mac to my macbook pro, would I be able to install SL then switch the HD back to my mac?