Slow eSATA Transfer with PNY ExpressCard

Hello...
I just installed a PNY ExpressCard - SATA II 2 Port (eSATA) (Model # P-NSA2-EC-RF) to my MacBook Pro 2.16GHz Intel Core Duo - 2GB DDR2 SDRAM - 100GB Hard Drive @ 7200rpm. The driver I am using to make the PNY ExpressCard work is the SiI3132, version 1.1.9 (found here: http://www.siliconimage.com/support/supportsearchresults.aspx?pid=32&cid=3&ctid= 2&osid=3&).
I am using this ExpressCard to connect to the eSATA port on an external Western Digital MyBook Studio hard drive (1TB).
The thing is that the external drive seems to transfer faster with the Firewire 400 cable, and not with the eSATA (which in theory should be much faster, right?).
Any ideas why this is happening?

Ok, here are the xBench (v. 1.3) results from my internal drive, and then the Western Digital MyBook Studio external drive, first with FW400, then with eSATA:
*Internal Drive on MacBook Pro (100GB @ 7200 rpm):*
Disk Test 37.11
Sequential 63.15
Uncached Write -- 62.06 -- 38.11 MB/sec [4K blocks]
Uncached Write -- 78.02 -- 44.14 MB/sec [256K blocks]
Uncached Read -- 43.05 -- 12.60 MB/sec [4K blocks]
Uncached Read -- 89.37 -- 44.92 MB/sec [256K blocks]
Random 26.27
Uncached Write -- 8.42 -- 0.89 MB/sec [4K blocks]
Uncached Write -- 79.37 -- 25.41 MB/sec [256K blocks]
Uncached Read -- 82.49 -- 0.58 MB/sec [4K blocks]
Uncached Read -- 113.65-- 21.09 MB/sec [256K blocks]
*Western Digital MyBook Studio (1TB) connected with FW400 (and all other cables disconnected):*
Disk Test 52.10
Sequential 52.60
Uncached Write -- 51.04 -- 31.34 MB/sec [4K blocks]
Uncached Write -- 54.40 -- 30.78 MB/sec [256K blocks]
Uncached Read -- 41.02 -- 12.01 MB/sec [4K blocks]
Uncached Read -- 73.04 -- 36.71 MB/sec [256K blocks]
Random 51.61
Uncached Write -- 22.04 -- 2.33 MB/sec [4K blocks]
Uncached Write -- 98.70 -- 31.60 MB/sec [256K blocks]
Uncached Read -- 81.71 -- 0.58 MB/sec [4K blocks]
Uncached Read -- 102.50 -- 19.02 MB/sec [256K blocks]
*Western Digital MyBook Studio (1TB) connected with eSATA (and all other cables disconnected):*
Disk Test 47.41
Sequential 46.14
Uncached Write -- 102.48 -- 62.92 MB/sec [4K blocks]
Uncached Write -- 113.28 -- 64.09 MB/sec [256K blocks]
Uncached Read -- 16.48 -- 4.82 MB/sec [4K blocks]
Uncached Read -- 134.90 -- 67.80 MB/sec [256K blocks]
Random 48.75
Uncached Write -- 18.71 -- 1.98 MB/sec [4K blocks]
Uncached Write -- 146.92 -- 47.03 MB/sec [256K blocks]
Uncached Read -- 72.00 -- 0.51 MB/sec [4K blocks]
Uncached Read -- 126.64 -- 23.50 MB/sec [256K blocks]
So, what does all this tell you?!

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Hello jumanon
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