External drive size issues

[GlockG20]

So a picture is worth a 1000 words... but I can't seem to get the screenshot loaded here... so the issue is I have an 8TB external hard drive, in KDE Partition manager it shows 7.28TB but down lower in the window it shows 7.28Tb with 21.61GB used and when I format the drive the system only sees about 1.3TB of the 7.28. This is a drive I have been using for Timeshift backups. While my system was Kubuntu 24.04. I just recently upgraded to 26.04 and went to run Timeshift when I started running into a series of odd issues. The biggest is Timeshift would fail to complete the back up.

[No Pain~]$ df -h
Filesystem Size Used Avail Use% Mounted on
tmpfs 3.1G 3.4M 3.1G 1% /run
/dev/nvme0n1p1 458G 21G 432G 5% /
tmpfs 16G 344M 15G 3% /dev/shm
efivarfs 128K 66K 58K 54% /sys/firmware/efi/efivars
none 1.0M 0 1.0M 0% /run/credentials/systemd-journald.service
none 1.0M 0 1.0M 0% /run/credentials/systemd-resolved.service
/dev/nvme0n1p3 470G 4.7G 442G 2% /Xtras
/dev/nvme0n1p1 458G 21G 432G 5% /swap
tmpfs 16G 36M 16G 1% /tmp
/dev/nvme0n1p4 8.6G 8.2M 8.6G 1% /boot/efi
/dev/nvme1n1p1 3.7T 1.7T 1.9T 48% /home
tmpfs 3.1G 5.4M 3.1G 1% /run/user/1000
/dev/mapper/sdb1_crypt 1.3T 8.9M 1.3T 1% /run/timeshift/50367/backup
/dev/sdh1 1.3T 2.1M 1.2T 1% /run/media/ian/f6d21463-bac6-4b76-88c7-90128a67c5b9

I tried doing a complete shred on the drive ( that was a 2.5 day evolution ) to see if that would clear things up and nothing. I have tried using different file systems and nothing seems to regain the total usable disk space. Don't know what to do now. Ideas?

[oshunluvr]

Re. posting a screenshot; New members have to have at least 3 posts before images are allowed. In my opinion, a screenshot for this problem likely wouldn't be helpful anyway.

To your issue: the df output alone doesn't convey much. It's simply shows mounted file system space usage. You might want to post the output of these commands as well:

sudo gdisk -l /dev/sdh

lsblk -l -o NAME,SIZE,FSSIZE,FSTYPE,FSUSED,LABEL,MOUNTPOINT,PARTLABEL,MODEL,UUID | grep sdh

If you're new to Linux, you can copy the above commands using your mouse, then paste them (one at a time) into Konsole by using CTRL-SHIFT-v. Then highlight and copy the output and post back here.

FYI, using CODE or QUOTE formatting tags when posting a copy-n-paste of text can help make your post more readable to others.