- sd0 is not your pen drive
- Your pen drive is sd1
Code:
umass0 at uhub3 port 1 configuration 1 interface 0 " USB DISK 2.0" rev 2.00/1.00 addr 4
umass0: using SCSI over Bulk-Only
scsibus3 at umass0: 2 targets, initiator 0
sd1 at scsibus3 targ 1 lun 0: <, USB DISK 2.0, PMAP> SCSI0 0/direct removable serial.13fe36001A000BBA4249
sd1: 7456MB, 512 bytes/sector, 15269888 sectors
- sd0 partitions are already mounted, which is why you get the device busy messages.
To see all of your currently mounted partitions, and how full they are, use:
$ df -h