How to get better than 5.2MB/s transfer rate from USB 2.0 on Mac Mini

G'day,
I've got a circa 2007 Mac Mini with 1GB of RAM, running Snow Leopard. Connected to this is a USB 2.0 500GB Seagate Freeagent drive from circa 2008. As far as I know, the USB disk is free of errors.
I am trying to use dd with a block size of 1MB to transfer a 250GB file from an Ethernet mounted Time Capsule drive to the USB disk on /dev/disk1.
A dd from the Time Capsule to the /dev/null gives me a transfer rate of ~35-40MB/s. However, when the target is /dev/disk1, the transfer rate is only around 5MB/s. I checked the system profiler and disk1 is connected to the USB High Speed Bus.
Any clues on how to improve USB 2.0 transfer performance?

Fragmentation is unlikely to be an issue since I was trying to write to the raw block device with dd which is as close to a pure sequential write scenario as one is likely to encounter (e.g. no small block, random access involved)
From a Linux host, I was able to dd to a file on the disk's file system at 20MB/s.
I'll run some other tests with another disk to see whether the issue is peculiar to the disk or to the Mac's USB subsystem.

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