Disk usage widget displays partially absurd values - why?

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1

I am currently setting up new hardware with Kubuntu 25.10 (Plasma 6.4.5, Wayland). In addition to the partition for Kubuntu (Btrfs), the SSD has one partition for Windows (NTFS) and one for data (ext4). So far, the data partition only contains an empty lost+found directory. According to KDE partition management, only 2.03 MiB of 2.02 TiB are occupied.

Now I have installed the Disk Usage widget (by Marco Martin). The values for the Kubuntu partition (32 GiB of 118 GiB used) are similar to those in partition management (25.15 GiB of 150 GiB used). However, the used value for the data partition displayed in the widget is simply absurd: 103.7 GiB of 1.9 TiB used.

What could be the reason for this?

Datenträgebelegung belegter Speicher SSD Bildschirmfoto_20260301_220511
Datenträgebelegung belegter Speicher SSD Bildschirmfoto_20260301_2205112351×751 350 KB

Is there a widget with realistic information for the data partition?

2

It may be accounting for the space reserved by ext4. By default, ext4 reserves 5% of the space so that would be pretty close to what you are seeing there.