Just like the title states, i accidentally ordered two SSDs for my 15'' Macbook Pro; both are Crucial m4, one is 256gb and the other is 128gb. Since my apps and OS were going to be going on the SSD (256gb is the one i am deff. keepingg) and my media is going on the HDD 7200rpm, would i see the kind of speed difference putting my media on a SSD as opposed to HDD as i will see putting my OS and APPs on one? if not them i guess ill just have to return it. Also, ive read somewhere that the manufactures advertise that a GB is 1,000,000MB but the OS thinks 1,024,000MB is 1GB. any way to make it look like 1mill MB is 1 GB in your OS? thanks.