Yellow Dog / PS3 writing to external hard drive

[The Doge]

I have been attempting to use my PS3 to rip some a blu-ray movie to see if it can be done. To this end I have installed the Yellow Dog linux software. One of the commands that I am to use is the following dd if=/dev/cdrom | split -b 4000m - /location/to/hard-drive/game.iso.

An example that they use of this command is dd if=/dev/cdrom | split -b 4000m - /media/PS3/Stuntman.iso.

My problem is that I am trying to write this to an external hard drive and cannot get the pathing correct. The name of the hard drive volume is SWISNIFE1

I have created a different folders on the external hard drive such as dark and dark.iso (I am working with the Dark Knight Blu-Ray disk) and tried the following paths. I receive the message that the folder cannot be found.
dd if=/dev/cdrom | split -b 4000m - /media/SWISNIFE1/dark.iso.
dd if=/dev/cdrom | split -b 4000m - /media/PS3/SWISNIFE1/dark.iso.

I then tried the following path that worked but wrote the data to the internal hard drive and not the external. The internal hard drive has only 10 GB available and filled up before the entire disk was ripped.
dd if=/dev/cdrom | split -b 4000m - /media/SWISNIFE1

Does anyone know the correct pathing to write the data to the external hard drive?

Thanks