External hd in dual casing, help needed

Hi
Just to warn you I'm not the most technical but I'll try and outline my question as best I can. I'm using a Intel Mac Pro, mainly for editing and many external drives for all the projects we are working on. I'm concern about the way they have been set up, which was prior to my arrival. We are using dual casings and putting in two SATA 300GB drives, the jumpers are set to RAID-0 SPANNING, with options to set it as Non-RAID-0 and RAID-0 STRIPING. At the moment the drives have been partitioned in disk utility and when on the desktop they come up as two drives. I'm wondering if this is causing some problems with the drives, should they be set up in disk utility as RAID, or would it be best to have a non-RAID-0 set within the casing. I'm concerned as we are having difficulty with many of the drives now and they are not too old. Any ideas on the best set up here and if the way they have been set it could cause problems would be great, again sorry for my lack of technical knowledge.
Thanks
Sri

A link to the drive case.
Is this a FireWire to SATA?
Does it use firewire cable or eSATA?
Too old is relative.
we are having difficulty... wondering if this is causing problems... with many of the drives....
I am more inclined to use native eSATA; to format in Disk Utility as single drives, RAID is okay but not if on FireWire bus/cable.
Nature of problem?
This is what I use (4)
http://eshop.macsales.com/item/Other%20World%20Computing/MESATATBEK/
Along with Sonnet Temp PCIe controllers
http://eshop.macsales.com/item/Sonnet%20Technology/TSATAIIE2P/
and using the two ODD ports using NewerTech kit.
http://eshop.macsales.com/item/Newer%20Technology/MPQXES2/
Are you using Maximus?
http://eshop.macsales.com/shop/firewire/usb/raid_1/Gmax
Or Mercury Pro RAID case?
http://eshop.macsales.com/shop/firewire/1394/USB/EliteAL/PerformanceRAID
- take a look at the two build your own cases at the bottom.

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