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4. Select the new hard drive. The total drive capacity after adding the drive will be shown. Click "Add
Hard Drive."
5. All the data on the new hard drive will be deleted during this process. The data on the original
RAID 5 or RAID 6 configuration will be retained. Click "OK". The NAS will beep twice.
To add hard drives to a RAID 10 disk volume, repeat the above steps. Note that you need to add an
even number of hard disk drives to a RAID 10 volume. The storage capacity of the RAID 10 volume will
increase upon successful configuration.
This process may take a few hours to tens of hours to complete depending on the number
and the size of the hard drive. Do NOT turn off the NAS during this process. You can use a
RAID configuration of larger capacity after the process.
Configuring Spare Drives
You can add a spare drive to or remove a spare drive from a RAID 5, 6, or 10 configuration.
Follow these steps to use this feature.
1. Make sure the status of the RAID 5, 6, 10 configuration is "Ready".
2. Install a hard drive in the NAS. If you have a hard drive which has already been formatted as
single disk volume on the NAS, you can configure this hard drive as the spare drive. It is
recommended to use hard disk drives with the same storage capacity for RAID configuration.
3. Select the RAID volume and click "Configure Spare Drive."
4. To add a spare drive to the selected configuration, select the hard drive and click "Configure
Spare Drive." To remove a spare drive, unselect the spare drive and click "Configure Spare Drive."
5. All the data on the selected hard drive will be deleted. Click "OK" to proceed.
The original data on the RAID 5, 6, or 10 disk volume will be retained. After the configuration
completes, the status of the disk volume will become "Ready".
Note:
A hot spare drive must be removed from the disk volume before executing the
following action:

Online RAID capacity expansion

Online RAID level migration

Adding a hard drive member to a RAID 5, RAID 6 or RAID 10 volume
Bitmap
Bitmap improves the time for RAID rebuilding after an unexpected error, or removing or
re-adding a hard drive from/to a RAID configuration. If an array has a bitmap, the member