Buffalo TeraStation 3000 User Manual page 85

Operating in JBOD
All data on that drive will be deleted after replacing the drive. You will not be able to use the TeraStation until you
format the new drive.
Operating in a Redundant RAID Mode
If you are using a redundant RAID mode such as RAID 1, 5, or 6, the RAID array will be in degraded mode after
replacing the drive. You will not be able to use the TeraStation until you rebuild the RAID array with the new drive.
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