Yes, the all plastic enclosure was a shock for me but I think there is some solid metal inside. Cost cutting

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The fans are so noisy that the brushed aluminium plastic needs to be replaced with... aluminium.
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On RAID 0.
I'm normally not a fan as it's so risky, especially with these WD consumer boxes. Great speed boost for READs but increased risk for data loss.
But I think my use of RAID 0 is legitimate in this case. I need the speed as my iMacs don't have FW800 and eventually I'll be doing some massive data churning.
But more importantly is I have an exact copy of all the data on the RAID 0 enclosure saved on tape. And the work I'm doing is script based and saved on my work computer and not with the data. Thus if I lose the RAID 0 enclosure then all I need to do is reload the data.
In this case and only this case I say: go for it with RAID 0.
When this project is done I'll convert both WD boxes, all 2T into one 500GB effective RAID set with RAID 0 and RAID 1 together. Technically called a RAID 0+1. OSX's Disk Utility can handle these. Don't know how I'll go overriding the presumably rudimentary RAID controllers in the WD enclosures. I think the WD HDDs / enclosures will be up to it.