Western Digital WD20000H1NC User Manual - Page 134

All 1 Drive configurations for the My Book World Edition II are considered, drives

Page 134 highlights

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. Starting Configuration Ending 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) 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 second drive added Deleted Still available Deleted Deleted Deleted Deleted Deleted Still available after rebuild 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) 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

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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