Buffalo TeraStation WSH5610DN2 User Manual page 94

If you must change a drive that is not malfunctioning, shut down the TeraStation before replacing the drive. If you
need to replace more than one drive at the same time, replace the drives one at a time to preserve your data. When
replacing a non-malfunctioning drive, follow the procedures below:
Operating in Stripe Volume
All data on the RAID volume will be deleted after replacing the drive. You will not be able to use the TeraStation until
the hard drive has been replaced. Refer to the ""SYSTEM DOWN" Is Displayed on the LCD Panel" section above for
the procedure.
Operating in a Redundant RAID Volume Other Than Stripe Volume
If you are using a redundant RAID volume such as RAID 5 or 6, the RAID volume will be in degraded mode after
replacing the drive. You need to recover from degraded mode by replacing the hard drive. Refer to the ""ONE DRIVE
DOWN" Is Displayed on the LCD Panel" section above for the procedure.
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