mkexfatfs doesn't work?

[Richard Shaw]

I just installed exfat-utils and I'm trying to format a 16GB microSD card:

$ sudo mkfs.exfat /dev/sdb1
mkexfatfs 1.3.0
Creating... done.
Flushing... done.
File system created successfully.

But it actually doesn't do anything. All the old files are still on the SD
card.

Thanks,
Richard