Format SD card

[CDR0224]

How do I format an SD card?

I can see it in Dolphin under devices and it is mounted, but when I right-click on it, there is no "format" option.
In Partition Manager, same thing, no way to format it.

Do I have to first unlock something?

[oshunluvr]

You can't format a mounted file system. In other words, if it's mounted, it already has a file system on it.

Here, when I insert a removable device - sdcard or USB - it appears in Dolphin but is not automatically mounted. When I right-click, Dolphin offers "Reformat" as an option.

KDE Partition Manager should be able to do this also.

[CDR0224]

Hmm, in Dolphin, when I don't mount it, it automatically mounts when I left-click on it.
Annoyingly, if I unmount it, it disappears from the removable devices and I have to unplug/plug it to see it again.

When I don't mount it, but instead first right-click, there is no format option either.

[cookiemuncher]

I know you can format a USB drive using Gparted. Not sure about the rest.