Very slow data trasfer to USB 2.0 external hard drive

This might have already been here, but was not able to find anything.
I have Mac Pro with 10.5.8 OS X version. I bought a 1.5 TB external hard drive formated it to HFS+ and plubbed it in. Drive pops up OK, but when I start trasfering files the transfer speed is some thing like 10-15 Mbits/sec which is quite a lot below the theoretical 480 MBits/sec. I know you cannot reach that but 10-12 Mbits/sec seems very low.
HDD is and Iomega HDD.
Could anybody suggest me somethig how to speed up the trasfer process. I edit HD video so the files tend to get rather large.
Thanks !!

hi,
i have the same problem and i have a MacBook Aluminium 2.4ghz with 2GB ram on it and i have a Maxtor External hard-drive
OneTouch:
Capacity: 465.76 GB
Removable Media: Yes
Detachable Drive: Yes
BSD Name: disk1
Product ID: 0x7310
Vendor ID: 0x0d49
Version: 1.25
Serial Number: XXXXXXXX
Speed: Up to 480 Mb/sec
Manufacturer: Maxtor
Location ID: 0x26200000
Current Available (mA): 500
Current Required (mA): 2
Mac OS 9 Drivers: No
Partition Map Type: MBR (Master Boot Record)
S.M.A.R.T. status: Not Supported
and there is 2 partition on it, i for mac (format as Journaled HFS+)
and the other for Windows as a FAT32
and transfer to any of the 2 partitions seem to be slow about 2MB/s.
but if i plug the external to a vista it transfers normally around 15Mb/s
any suggestion would be very helpful!!

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Very slow data trasfer to USB 2.0 external hard drive

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