@kylenap Because of your issues, make sure your backups are up to date. then initialize that disk and use "Add disk".

@kylenap If you want it unmounted, that is OK, either way.

@kylenap Certify the disk is my recommendation.(36 hours or so to do this) Plug in the Time Machine disks. Make sure the volume mounts. If so, in...

@kylenap I assume your Time Machine volume can mount? If it does not, no point in going further. If it can mount, unmount it. shut down. Pull out...

@djorason What MacOS version are you using? You just purchased a new license to SoftRAID Premium?

@kylenap A certify takes almost two days with those drives. I saw a bug in SoftRAID where it reported as completed after a short period of time. ...

@allenat Does seem like an enclosure issue. Get a Thunderbay next time, better reporting/monitoring than USB. Your drives will pop right in, if y...

@kylenap When you certify a disk, it should have a ? in the disk tile. this indicates you initialized the disk, after certifying it?

@allenat If you backup, then swap drives, does the error follow the drive, or the slot?

@kylenap You unmounted the disk? Can you zero disk in SoftRAID?

@kylenap You need to disable auto backup in Time Machine, it keeps it permanently mounted otherwise.

@kylenap Disk Utioity often fails erasing SoftRAID volumes. 1. Make sure if it is HFS, you erase it as HFS (MacOS extended) If APFS, erase as APF...

This appears to be a bug in SoftRAID App: 2024.10.24 - 10:08:15 - SoftRAID Application: Certifying the disk disk11, SoftRAID ID: 0A6D9164C129D480, U...

that is an indication the SoftRAID app cannot fully load. SoftRAID 5.8.4 does not work with Catalina, however, 5.x was end of the road with Big Sur.

@droct We had some teething problems back then, its fixed now. "Deactivate/Activate" your license to see your Premium subscription. thanks!