Western Digital My Book World Edition (white light) User Manual - Manual (Page 134)

NETWORK STORAGE MANAGER: ADVANCED MODE - 128
MY BOOK WORLD EDITION
USER MANUAL
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.
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 Ending Configuration User data condition after second
drive added
JBOD (1 Volume) Spanned (Linear) Deleted
JBOD (1 Volume) JBOD (two volumes) Still available
JBOD (1 Volume) RAID 0 (Striped) Deleted
JBOD (one volume) RAID 1 (Mirrored) Deleted
RAID 1 (Mirrored) Spanned (Linear) Deleted
RAID 1 (Mirrored) JBOD (two volumes) Deleted
RAID 1 (Mirrored) RAID 0 (Striped) Deleted
RAID 1 (Mirrored) RAID 1 (Mirrored) Still available after rebuild
Starting Configuration User data condition after one drive fails
Span (Linear) All user data is lost
JBOD User data on good drive still accessible
RAID 0 (Striped) All user data is lost
RAID 1 (Mirrored) User data on good drive still accessible, but with
no data redundancy