Western Digital WD ShareSpace User Manual - Manual (Page 141)

NETWORK STORAGE MANAGER: ADVANCED MODE - 136
WD SHARESPACE
USER MANUAL
If you add or remove drives, the new number of drives will determine which options
are available. For example, with two drives, you can choose span, stripe, or mirror. If
you add two more drives (for a total of four drives), you can then choose span, stripe,
RAID 5, RAID 10, or 2 mirrors. On the other hand, if you have two drives and remove
a drive, you're left with a single drive and will only have the span option.
Extend Span: This option is only available when adding a drive to an existing RAID
array that is configured as span. It can be done automatically or manually (see page
121).
Manage RAID
Configure RAID on the hard drives using the Manage RAID tab on the Volume
Management page. The default RAID configuration is Span for two disks and Raid 5
for four disks.
WARNING! Changing the RAID configuration causes all volumes and
data to be lost.