'reactivate disk' errors

We have a Tyan TA26 2U, with 7 SCSI drives.  Two disks are mirrored with the OS (Win2003 SBS), four are Raid-5 with data, and one stand-alone with client apps.  The last one is the 'problem child.'  We used to have the swap file on it and started getting the errors described.  I moved the swap file to the Raid-5 data drive and disabled the write-caching on the 'errored' disk.  We've also replaced the old disk in that slot with a brand-new Seagate which checks out on every utility including chkdsk, Seatools and Activesmart.  We still get the same errors, but ONLY on this disk.  I haven't moved the disk to another bay but have thought about moving the mirrored volume of the OS drive to that slot and the Seagate to the other bay.  Any thoughts?

Here's error #1:

Event Type:      Warning
Event Source:      dmio
Event Category:      None
Event ID:      37
Date:            1/24/2008
Time:            9:34:49 PM
User:            N/A
Computer:      SERVER02
Description:
dmio: Disk Harddisk0 block 34346519 (mountpoint G:): Uncorrectable write error

I also get this error:

Event Type:      Error
Event Source:      adpu320
Event Category:      None
Event ID:      11
Date:            1/24/2008
Time:            9:34:33 PM
User:            N/A
Computer:      SERVER02
Description:
The driver detected a controller error on \Device\Scsi\adpu3201.