Hi David and Teresa,
OK You have a B2.
First I will point you at a section of the Brennan web site which explains all you can do using the Front screen and round knob of the B2's menu system.
Have a look through this because while the Web UI is good for using the Brennan, when you want to do things to /with the B2 you will need to use these menus.
Lets first sort out your nice new Terabyte Drive. For the B2 to see/use this it needs to be FAT32 format not exFAT (as you have discovered).
The best way to format it to FAT32 is to use your B2 (and the menu system).
Plug the drive into the USB A port of the B2, power up the B2 and let it finish booting. Then using the Display and Front knob, go-
Main Menu > Settings > Maintenance > Format USB A
This should not take too long.
The next thing I would like you to do is make a "backup" of your B2's music.
Unplug the Terabyte drive from the USB a port, then I would now like you to go -
Main Menu > Settings > Scan Disk
This may take some time (the red light will flash).
When the red light stops flashing please press and hold in the "Stop/Play" button until "Saving" appears on the Front display.
When the clock reappears, please power the B2 off, plug the Terabyte drive into the B2's USB C port and then power it on again and wait for it to boot.
Then go -
Main Menu > USB Functions > Export to C
This is the recommended backup for a B2. It does a backup of the entire music collection to the drive in USB C and is incremental for subsequent uses of Export to C. The music is organised artist->album->track. Use in conjunction with Import USB C.
This may run for some time - leave it to finish no matter how long it takes - it finishes when the read light stops slashing.
When the red light stops flashing please press and hold in the "Stop/Play" button until "Saving" appears on the Front display.
When the clock reappears, please power the B2 off, and Unplug the Terabyte drive then power it on again and wait for it to boot.
Keep your Terabyte Drive safe!!
Next plug an empty USB stick into the B2's USB C port and go
Main Menu > Settings > Maintenance > Format USB C (Please NOTE this will DELETE anything previously on the stick)
Using the Web UI create a small playlist of some of your music (just small for this test)
then go
Main Menu >
Playlist Menu > Export to C
This operation will write all the music in a playlist to the drive in USB C. It can take a long time if the playlist is big. Originally intended for transferring smallish collections that you can listen to in the car for example.
When the red light stops flashing please press and hold in the "Stop/Play" button until "Saving" appears on the Front display.
Once the clock reappears you can unplug the USB drive and try it in your car.
Fred