One IDE drive and one ATA drive in a single RAID enclosure?

I just got an OWC AL Elite dual-drive RAID enclosure, and was told, by OWC, that I could drop an IDE drive and an ATA drive into the enclosure and it would work fine.
It's not - If I unplug one of the drives, it works fine: the drive mounts and shows up in Disk Utility, but when both drives are plugged in, it doesn't mount, and Disk Utility sees the drive as a single 2TB drive (one drive is 300GB the other 160GB).
any thoughts? I have the jumpers on the drives set at Cable Select, I tried them both on Master and the drive wouldn't even show up in Disk Utility.
thanks

Yes. I have it. They sell a model for ATA drives and SATA drives. Go into the "external enclosures" section and scroll down about halfway. It's in the multi-drive section.

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