Seagate NAS OS 4 U User Manual page 106

RAID 1 provides enhanced data security since all data is written to each hard drive in the volume. If a single
hard drive fails, data remains available on the other hard drive in the volume. However, due to the time it
takes to write data multiple times, performance is reduced. Additionally, RAID 1 cuts storage capacity by 50%
Note on RAID 1 hard drive requirements: A standard RAID 1 configuration includes two hard drives
of equal capacity. However, NAS OS allows you to create a RAID 1 volume with up to three hard
drives or, three hard drives plus a spare. It is also possible to create a RAID 1 volume using a single
hard drive. While a volume with one hard drive cannot provide data protection, it is ready for
expansion when new hard drives are available. Data protection would become available once a
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.or more since each bit of data is stored on all disks in the volume
.second hard drive is added to the RAID 1 volume
10/18/16
RAID 1
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RAID 5
Seagate NAS OS 4