That worked. Disk was rebuilt successfully and seems to be working normally now after being added to the existing volume. Thanks for the help!

On this second try, the disk successfully certified with 0 errors. Is the next step trying to add the new disk to the volume? If so, is there anything...

Actually, an update. I restarted the certification again and so far it's been going for quite a few hours. Have it complete 3 passes, so I'll see if i...

Left the Time Machine mounted and tried certifying the disk, but it failed again after about 20 mins saying that it hung.

Ok, I'll try that. Should I keep the Time Machine unmounted during the certification process, or can it remain mounted? I have Time Machine mounted ag...

That worked. Was successfully able to zero sectors of the the new disk. What are the next steps?

Attached it the support file I just created. Let me know what next steps you would like me to try after you take a look at it.

This screen recording was taken after I certified the disk last night and tried zeroing out the disk as you said. I assuming that's why there is no lo...

Last night I actually tried certifying the disk again and it did complete it successfully. I then tried zeroing the disk and I keep getting an error. ...

Disabled auto backup and tried again and still the same result. Even tried restarting the computer, checked that it was still unmounted, and get the s...

Unmounted the volume in SoftRaid, then tried to erase the drive as HFS (since this volume is used as a Time Machine) and I still get the same error as...

When I try to Erase the disk in Disk Utility is fails and shows this: Very strange since when I first installed the disk, everything went fine un...