I already used the same drive in another Macbook, with Mac OS Tiger. And it works the same as in the PC, blink only when it is working. And sometimes, in my MacBook Pro, I tryied to eject the drive, but it did not work out, when I do that the drive starts to work well (like in PC and other Macbook).
I will try to contact Kingston (the brand of my drive) to ask about it, because I use it at home and at my job.
Thanks anyway.