Hardware :: Leopard + Silicon Image 3132 ESata Expresscard

I have a WD MyBook ES that has both USB and eSata ports. I have 2 partitions on it- 1 is HFS+ and the other is FAT32. Both work fine with USB. With the ExpressCard however, I encounter a problem with the HFS+ partition. Both show up under Leopard, but after I copy 1 or 2 files to the HFS+ partition I get either a "Filename too long" error or an "unexpected error" -50 error code on any other operation. From that point forward, the partition acts as if its read-only, but doesn't show that in any of the permissions. All write operations fail after this.

However, the Fat32 partition continues to work just fine, and does not appear to suffer from the same problems. It seems I can copy files to and from it all day without problems. Both are on the same drive, going across the same controller. The card is a T-EC2R made by ONNTO [URL]. Its essentially a reference implementation of the sil3132 expresscard eSata 2. In fact, I've flashed the reference bios to try to troubleshoot the problem, and I'm using their drivers since ONNTO does not provide mac drivers for this card. The short story is that I ordered the T-EC2S, which does have drivers for OS X, but they shipped me the T-EC2R. When I realized it was a reference design, I just used the drivers from Silicon Image...............