2.5 Inch Hard Drives not all IDE.

I have purchased a portable USB hard drive, its a Simpletech
Pinifarnina 2.5 inch 160 Gig (on the left). I noticed that the new
portable hard drives are SATA based. On the right is an IDE. If you
are replacing a hard drive in your notebook computer, make sure you do
some research because you may end up sol. Most newer Laptops do use
SATA such as Macbooks, HP's etc.. but if you are looking to replace an
iBook, you will need to go looking for an IDE drive.