My USB SSD T7 showing 26GB free space when in fact it is more than 400GB free

Volumio 3 working well on RPi4 with USB SSD T7 500GB and cheap Berhiger DAC.
When I access the T7 from a PC (Linux Mint), I see 26GB free space available when in fact when I plug in the T7 to the PC I see more than 400GB free. The T7 seems to be formatted as “FUSE”. Maybe I should reformat to FAT32 or something else. 5I think it makes sense to use a format compatible with both Linux and Windows.)

Could be the formatting, worth a try. Do you boot with the SSD? If so, Volumio would have required a LONG time to resize such an enormous partition before first use.

Thanks Simon

I boot with microSD 32GB

Maybe its a question of not understanding inodes?
See below

volumio@volumio:~$ df -h
Filesystem      Size  Used Avail Use% Mounted on
/dev/mmcblk0p2  2.5G  425M  1.9G  19% /imgpart
/dev/loop0      364M  364M     0 100% /static
overlay          26G   18M   25G   1% /
devtmpfs        919M     0  919M   0% /dev
tmpfs           959M     0  959M   0% /dev/shm
tmpfs           959M   19M  940M   2% /run
tmpfs           5.0M  4.0K  5.0M   1% /run/lock
tmpfs           959M     0  959M   0% /sys/fs/cgroup
tmpfs           959M     0  959M   0% /var/spool/cups
tmpfs           959M   32K  959M   1% /tmp
tmpfs            20M  656K   20M   4% /var/log
tmpfs           959M     0  959M   0% /var/spool/cups/tmp
/dev/mmcblk0p1   92M   54M   38M  59% /boot
/dev/sda1       466G   86G  381G  19% /media/T7
tmpfs           192M     0  192M   0% /run/user/1000

Ok, so the rest is visible under /dev/sda1. That 381 gig is usable for media storage if you want.