Western Digital WD10000AH1U - Mac Edition User Manual page 134

Manage RAID Options (My Book World Edition II)
Any existing mode can be changed to any other available mode using the Manage
RAID option. The following table provides the available modes and data availability for
a My Book World Edition II with one drive after adding a second drive.
Starting Configuration
JBOD (1 Volume)
JBOD (1 Volume)
JBOD (1 Volume)
JBOD (one volume)
RAID 1 (Mirrored)
RAID 1 (Mirrored)
RAID 1 (Mirrored)
RAID 1 (Mirrored)
All "1 Drive" configurations for the My Book World Edition II are considered
"Degraded" RAID modes. When a drive fails in a My Book World Edition II with two
drives, the following table applies regarding the user data on the remaining good
drive.
Starting Configuration
Span (Linear)
JBOD
RAID 0 (Striped)
RAID 1 (Mirrored)
Ending Configuration
Spanned (Linear)
JBOD (two volumes)
RAID 0 (Striped)
RAID 1 (Mirrored)
Spanned (Linear)
JBOD (two volumes)
RAID 0 (Striped)
RAID 1 (Mirrored)
User data condition after one drive fails
All user data is lost
User data on good drive still accessible
All user data is lost
User data on good drive still accessible, but with
no data redundancy
NETWORK STORAGE MANAGER: ADVANCED MODE - 128
MY BOOK WORLD EDITION
User data condition after second
drive added
Deleted
Still available
Deleted
Deleted
Deleted
Deleted
Deleted
Still available after rebuild
USER MANUAL