Hi, I have a Macbook Pro 13'' that I bought around 2009. I decided to switch the internal HD to a larger one. However, I can see the HD in disk utilities. Then I thought that it might have been the hard drive issue, but I can see/format it when plugged into another laptop (Not apple), so I know the hd is working fine. So I formatted it to hfs+ in ubuntu. I tried the old hd and I would be able to see it in disk utility each time. I was wondering if there is something i'm missing or does the mac only recognise certain hds with strict specifications? I've tried multiple hd's with the same result. seagate, fujitsu, toshiba. The current hd the mac uses and sees is hitachi. Any help is appreciated.