USB on G4 PB broken for RAID?

Hello :
I've found neither "Disk Utility" nor "SoftRAID" are able to create a reliable "mirror RAID". Both exterior drives are new, identical 500 gB barracudas in WiebeTech SilverSata cases. (USB & SATA ports only). No other devices on the USB ports. The computer is a 12" powerbook about two years old.
I was prompted to attempt RAID because a previous, USB external 500 gB drive I used for backup was toast after a mere two months!
Has anyone else run into USB/drive problems?
DW

I have never had trouble using Apple's or SoftRAID's, but I would never use it on USB. SCSI and SATA, yes. ATA, ONLY if EACH drive is on its OWN channel (not shared with another drive, same for FireWire).
USB 1.1 is too slow AND is very cpu intensive (25%) and poor on PPC.
Both drives need to be on identically performing interfaces, FW400 is faster than your internal drive ATA but "might" work. USB 2.0 even might. Do you have USB2? If not, time for MacBook Pro or something maybe. Better spend the money there than SoftRAID ($149).

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