USB Powered HDD fails - Alu iMac 2.4GHz 21 inch

Hey folks,
I have an aluminium iMac 2.4GHz 21 inch model.
I have been using externally powered USB and FW devices for a while and had no issues. However, I just picked up a USB powered HDD and it cannot consistently transfer data. This same drive works perfectly on my Dell laptop, and I tried another USB powered drive from a friend (which I also know works) on my iMac and it has the same problem - cannot do any sort of mass data transfer.
I have a powered USB 2 hub (4 port Belkin) and obviously three ports on the iMac.
I also have two externally powered drives, both of which work fine.
It appears that any transfers from the INTERNAL drive to a USB Powered drive work ok, but any significant transfers from a USB drive (externally powered) to the USB powered drive FAIL.
I have tried plugging the USB powered drive into the iMac directly, and into the USB powered hub, no difference.
I suspect that the USB on the iMac just cannot handle either the power requirements or the data throughput requirements.
The external USB powered drives are:
Western Digital Passport 250GB.
Iomega Select 500GB.
Any hints? Or is this desktop machine just not made to work with USB powered devices???

If your two powered external drives are always connected to the iMac, you should really reformat them to +Mac OS Extended (Journaled)+, and not use a Windows format. There are other limitation to FAT32, because it is an old file system from a time when hard drives were very small. One is that data is not stored as efficiently, so the same files (especially if there are a lot of small files) will take up more space on the drive. Another potential conflict is file naming convention; an allowed file name on one may not be allowed in the other (between a Windows format and a Mac format). There is also no journaling with FAT32, which is a feature that helps with data corruption issues. There are probably other disadvantages to using FAT32 on a Mac.
As a test with that external USB-powered drive (the one you own), you should use Disk Utility to reformat it to a Mac format. Then, try the file transfer again. If it works, then the cause was the existing formatting, although the exact reason may not be clear. If you need it to be FAT32, you can try using Disk Utility to format it as +MS-DOS (FAT)+. Maybe if the Mac does the formatting, it will resolve this problem, even it is still formatted as FAT32 (and it should still work on a PC).
When going from Mac format to Windows format on the entire drive, you may want to use the Disk Utility Partition tab, and not the Erase tab. On the Partition tab, reset the +Volume Scheme+ to one partition. Click the Options button and it will show the three possible choices for +Partition Map Scheme+. When you format it as +MS-DOS (FAT)+, select +Master Boot Record+. When you format it as +Mac OS Extended (Journaled)+, select +GUID Partition Table+.

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    Hi and welcome to the forum!
    If you created recovery discs you can use them, if not there also an option to buy them from lenovo.
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    Maliha (I don't work for lenovo)
    ThinkPads:- T400[Win 7], T60[Win 7], IBM 240[Win XP]
    IdeaPad: U350
    Apple:- Macbook Air [Snow Leopard]
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