logic and error with sample rate when using exeternal fw drive

[outsider]

hi, I am a new mac user, i own an m audio 1814 fw card, and just bought a lacie 500 gb rugged model, (with 3 interfaces, fw 400 and 800 and usb) (http://www.lacie.com/it/products/product.htm?pid=11085)

i set up on my macbook pro, in fw chain, mac book-lacie- m audio, i opened logic and try to run a project of 16 tracks stored on lacie, but i had error with sample rate, it reads 46056, and after stop and play it reads another value,
both hard disk and audio card are power supplied,
now a inverted the order, i set up first audio card and at the end the lacie and it seems it works, but i would like to understand why i got this problems

 

[dgatwood]

Sadly, the M-Audio FW1814 has a rather broken FireWire implementation. It cannot be the second device on the chain or it just plain doesn't work. If you put the hard drive after it on the chain, it may work. If your machine has two FireWire ports, use separate ports for the two devices.

M-Audio's FireWire interfaces are the only audio interfaces I have ever encountered that have this problem. They fail miserably even if you attach them as the first port on a powered hub. Thus, I can only conclude that they must be doing something very, very wrong, but I have no idea what. I am not a FireWire hardware engineer.