I've been messing around with my usb, trying to make a live usb with debian on it. I used the dd command in the terminal. After multiple failures I just gave up, and I want the usb back to normal.

I tried fixing it whit the KDE partition manager, realizing that I suck with the terminal.

The manager displays the drive and the sdb1 partition on it but the file system is unknown. I can't do anything other than delete the partition.

The partition is successfully deleted and I'm left with unallocated space.

I click on "new partition", keep the settings normal, ext2 file system, and then apply changes.

Here's where the errors happen and the operation is aborted. This is the output:

Job: Check file system on partition ‘/dev/sdb1’
Command: e2fsck -f -y -v /dev/sdb1
e2fsck 1.42.9 (4-Feb-2014)
/dev/sdb1 is in use.
e2fsck: Cannot continue, aborting.

Check file system on partition ‘/dev/sdb1’: Error
Create a new partition (14.91 GiB, ext2) on ‘/dev/sdb’: Error

I've tried formatting to different file systems but i always get the same error, i also tried formatting it on a windows machine but with no success either.