me!

I have a problem USB drive. It had about half a gig of backup on it and is supposed to be a gig itself. When I was trying to delete some items in the wastebin on the drive itself everything got erased. No big shakes as it was only a backup. Problem is now the drive shows itself as empty put has only half a gig freespace!

So I think it is time to reformat! I started parted (dont have cfdisk). There is no sda when I open /dev. It appears that the usb is showing up as /media/usbdisk. I try select /media/usbdisk and it gives the following error:

Warning: Unable to open /media/usbdisk read-write (Is a directory).
/media/usbdisk has been opened read-only.

So how to open in write mode?