Chris,
Sorry for the delay I've been sick the last few days.. The controller in question is a Intel 8 series /C220 Series SATA AHCI Controller 8C02.... I've been checking the windows and server logs... it appears that the drive was somehow added to the server backup and as a result removed from the pool... not sure how this could happen without human intervention... I suspect one of the admins on site... I removed the drive from the backup and added it to the pool and will check on it today.
Thanks Again,
Gene