Eric Wood wrote:

I did Warren's RAID-1 howto:
http://togami.com/~warren/guides/remoteraidcrazies/
===========
1.  On this system I raid-1 /dev/hda and /dev/hdc together.

And I'm getting these errors during the copy process.
hdc: dma_intr: error=0x84 { DriveStatusError BadCRC }
hdc: dma_intr: status=0x51 { DriveReady SeekComplete Error }
 

If you haven't already, then it may be worth checking the output of 
smartctl -a /dev/hdc  - just to satisfy yourself that the drive is 
feeling happy with itself...

http://smartmontools.sourceforge.net/

Tim.