RAID 5, the most prevalent configuration today, is much less expensive than RAID 1
It has a unique auto-rebuilding feature that in the event of a drive failure in RAID 1
will rebuild the lost data while allowing access to the other drive, a powerful way to protect critical data.
IDE: RAID 1
(with two or more drives) and IDE RAID 5 (with three or more drives) permits a failed drive to be pulled out of the PC enclosure and a new drive swapped for it without stopping the system.
The entry-level AAA-131U2 Ultra2 SCSI RAID card provides robust data backup reliability with RAID 1
and RAID 5 structure for Seiko Epson's Windows 2000-based, next-generation ERP systems.