Why do you want to replace or add a firewire connection with this drive? The USB 3.0 connection provides a faster data rate than the Firewire. The only faster unit today is the Thunderbolt. USB 3.0 provides up to 5GB per second, whereas a Thunderbolt drive will give you up to 10GB per sec. (Note: The drive you presently are asking about is NOT Thunderbolt ready, but a Thunderbolt drive, even though a bit more costly than a USB 3.0 drive, would be the way to go if your lookin for faster data transfer).