Promise Pegasus J4 striped raid - error-36

Hi
I have a new macpro running mavericks
I have a promise pegasus j4 that I'm trying to set up as a striped raid..via thunderbolt
I have 4x crucial m500's in it.
Using disk utility I can see the individual drives.
on each I erase date and format as mac os extended journaled
I've individually deleted the partitions on them
I've then selected the 4 drives and created a striped raid set (mac os extended journaled
Untitled striped raid set icon appears on my desktop.
Any data I write to it stops after about 2gb. error -36
I've written 100gb of data to each of the drives individually - all fine.
I've tried using softraid - same issue.
Drive Genius says i/o on disk
Crucial say it's a problem with the Promise Pegasus.
Promise say I'm creating the RAID wrong.
"Current Response : No this is not right. you need to delete the partition then create the RAID and then create the partition and formatting.
but once the Untitled striped raid set icon appears on my desktop there's no way to then create the partion and format - the options aren't there in disk utility - and now their tech support have gone silent.
Advice appreciated
Kindest'
Jon

I encountered this error too, and it does indeed appear to be a weak power supply in the Pegasus J4. I am currently using the device with a sort of hackish work around...
SSDs use maximum current when writing; reading and idling draw far less power. So instead of defining one big RAID set, which causes all 4 drives to be writing nearly simultaneously on large transfers, I set the unit up as two independent RAID volumes, each comprised of two disks. This configuration works well for me since I do not do large writes to both volumes at the same time... this restriction may not be acceptable for everyone. As long as I don't write large amounts of data (over about 2 gigabytes) to both volumes at the same time, everything works reliably. This would tend to support the theory that the power supply just is not up to the task of keeping 4 M500s writing simultaneously for long periods of time...
Hope this helps someone (actually I really hope Promise improves the power supply - this unit is not exactly cheap and a wimpy power supply is pretty inexcusable).
BTW - does anyone know where you can download the Pegasus J4 FW updater software? I cannot find my original CD...
-Rory

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http://www.amazon.com/exec/obidos/ASIN/B000NAXGIU/arizomacinusergr
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