exFAT USB drive not mounted

[ngong]

Just installed Ubuntu 24.04 on a new computer.

An exFAT 4TByte Sandisk "G40" SSD USB drive is not recognized by my Ubuntu installation.
Neither if I start it connected, nor if I plug it in after boot has finished.

The G40 is recognized on the USB port of another Win10 computer without problems. Even checking the drive with Win10 file explorer leads to "no errors". Hence, I assume there is nothing wrong with G40.
Plugging the drive into an USB 3 port leads to this lines when running sudo dmesg:

[114178.524051] usb 1-1: new full-speed USB device number 6 using xhci_hcd
[114178.685207] usb 1-1: New USB device found, idVendor=4791, idProduct=2066, bcdDevice= 0.00
[114178.685225] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[114178.685230] usb 1-1: Product: PRO G40
[114178.685234] usb 1-1: Manufacturer: SanDisk
[114178.685237] usb 1-1: SerialNumber: 03010A00A1080000B6B0400AB80E0500

I expected to see it mounted somewhere below /media, as with another 4TB Sandisk "Extreme" SSD. However that one is formatted to ext4 instead of exFAT.

Running lsusb shows the G40 as

Bus 001 Device 006: ID 4791:2066 SanDisk PRO G40

lsblk does not show a name for the G40, as it does with Extreme, I expected something like

sdx 8:0 0 3.6T 0 disk
└─sdx1 8:1 0 3.6T 0 part /media/rsc/<some uuid>

The command

sudo dmesg | grep -e "sd[a-z][1-9]

shows just the sda1 drive for the Extreme, but nothing for G40.

What to do next to find the cause why G40 is not mounted automatically?
Is it possible to assign it manually to drive entry like /dev/sdb1?

[oldfred]

I prefer to label all partitions, particularly those I may only mount occasionally, so default mount is by label, not UUID.
I understand a label, but have no idea which UUID is which.

Did you use exFAT with Windows?
Windows sets fast startup or hibernation flag on all Windows partitions. That prevents default mount to prevent loss of data. If you write into a hibernated system, the data is lost when hibernation restored.
Fast Start up off (always on hibernation), note that Windows turns this back on with updates, SHIFT + Shut down button
http://ubuntuforums.org/showthread.p...2#post13488472
https://www.elevenforum.com/t/turn-o...ndows-11.1212/

Also while exFAT slightly better than FAT32, it still is not recommended for larger file systems.
The standard exFAT implementation is not journaled and only uses a single file allocation table and free space map.
But exFAT will store larger files than FAT32. But still should not be used for larger partitions as chkdsk may take forever.
You can only run repairs from Windows and exFAT does not support Linux ownership & permissions.

you can see lots of details of your partitions:
lsblk -fmp | grep -v snap