Replacing a drive with a bad sectors or blocks

[attroll]

I am getting the following message on my NAS TS5800 "The number of bad sectors or bad blocks on drive 1 may have exceeded the allowable value".

I have new drive that is the same size to replace this one in the NAS.
It is my understanding that I need to power down the NAS and then insert the new drive in the NAS and then boot it back up.

Then when it boots up do I need to Rebuild Raid Array or will it rebuild automatically?

I looked in my NAS admin section ahead of time (before I install the new drive) to make sure I could find the Rebuild Array function but and not seeing it.
Where is this going to be at in my admin section or will the Rebuild Disk Array appear after I put in the new drive?

I don't want to run into problems after I install the new drive, this is why I am asking now before I put it in.

[davo]

RTM:

https://www.buffalo.jp/s3/guide/ts/5000/en/pc_index.html?Chapter4#h3anc12

[attroll]

I red this before I posted. This only refers to replacing the drive if the errror light is flashing red. I have done this before when it has flashed red.
However, I have never done it with a drive that has a green light with an error message.
Do I still shut the drive down and then replace the drive?
Will it rebuild automatically also?

[davo]

The process is the same regardless of LED status.

[attroll]

Davo
I did as you said.
I powered down.
Removed and replaced the drive with a new drive that is the same.
I powered back up.
Now I am getting the message Unformatted.
When I go into the admin settings it now says:
Array degraded and Disk 1 unformatted.
It did not rebuild.
What am I suppose to do now?

[Eastmarch]

Don't format it. If you call support, they can totally help you, but The goal is to get the I31 message on the LCD. if it's not comin up, dismount and remount the replacement (NOT A MEMBER OF THE ARRAY!) and that should get it to go to I31. if not, it's possible the drive has a utility partition, which some drive manufacturers put on there and its an invalid size (smaller than the existing disks). You can clear these sometimes by following this : https://www.buffalotech.com/knowledge-base/cleaning-a-disk-in-windows-7-using-diskpart

When I31 shows, it will prompt you to hit 'Function' to start the rebuild on the LCD.