External Hard Drive - speed caps at 1MB/sec

From my computer I cannot get write speeds of more than 1MB a second to my external Lacie Drive. I can grab information off the External Drive fine, but cannot write to it faster than 1MB a second. This situation started after I crashed while writing to it.
1. Plugging into another computer, everything works fine and can write fast to the external.
2. Writing to the drive from a file on a network works fine. (pulling a file from my office network and writing to the External Drive through the computer with issues works)
3. Tried different cables. This issue is with USB, Firewire 400 and 800.
4. Reset the PRAM on my computer, still nothing.
My setup is:
- G5 / 4 x 2.5 GHz PowerPC
- Mac OS 10.4.11 (cannot upgrade higher due to certain software requirements i'm running)
- 1TB LaCie BIG DISK Extreme (USB2, Firewire 400, Firewire 800)
Any ideas? Much appreciated.

I've e-mailed LaCie tech support and am waiting for a response. Since other hard-drives work with this machine I feel like there is some connection between this computer and this drive which won't let me manually write to it. I've transfered a huge file using the Terminal to the external drive and it went fine (at normal speeds). Very odd.

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