When using a hard drive, you won't notice the difference. But with a SSD, you will. As the PATA bus is ATA/100 and is two thirds the theoretical maximum of the SATA I port in that Macbook.
When using a hard drive, you won't notice the difference. But with a SSD, you will. As the PATA bus is ATA/100 and is two thirds the theoretical maximum of the SATA I port in that Macbook.