Daisy chain Voyager hard drives & iMac Intel Core2Duo (white model)

It would appear that Voyager hard drive enclosures from Newertek won't allow you to daisy chain them via SATA. Yet they conveniently provide you with a SATA cable if you have an eSATA port on your Mac. Is there any sort of KVM switch/ hub that makes the SATA hard drives connect directly to each other via SATA instead of via the iMac's Firewire for data transfer.
I'm finding I large gobs of data to transfer between two hard drives, and a dual drive enclosure never likes to remain mounted on my iMac no matter whom I buy, so I'm dealing with these Newertek Voyagers. The other thing that's messed up about these Newerteks is if both are plugged in to the two Firewire ports of my iMac, when I wake up in the morning, I can't eject either one without a force eject. I'm hoping if I can daisy chain them somehow by SATA I'll get faster data transfers, not have to copy back to my iMac everytime I want to copy to the other drive, and have more reliable connectivity with only one Firewire port of my iMac in use.

You can get them - "firewire to sata bridges" is the term.
I don't think it'll make any practical difference - writes will still have to go from one disk, through SATA to the firewire to the Mac, then back out the firewire to the other SATA. There's no controller to handle the direct connection.

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