Computer:~ GG5$ cd /volumes
Computer:volumes GG5$ lsl
total 8
drwxrwxrwt@ 6 root admin 204 Dec 19 07:24 ./
drwxrwxr-t 48 root admin 1700 Dec 5 22:17 ../
d--x--x--x+ 3 root admin 102 Dec 14 23:09 Gigabyte/
drwxr-xrwx 25 GG5 GG5 918 May 10 2012 Gigabyte 1/
lrwxr-xr-x 1 root admin 1 Dec 19 06:47 Lemon@ -> /
Computer:volumes GG5$ umount gigabyte
umount: gigabyte: not currently mounted
Computer:volumes GG5$ mount gigabyte
mount: gigabyte: unknown special file or file system.
This is a *ghost drive* generated by unknow forces in Mac OS X. Because the real volume has been renamed (a suffix was added) access to it by automated programs is prevented. The solution is to delete the ghost drive.
MacEnable 