ubuntu@ubuntu:~$ parted /dev/sdb
WARNING: You are not superuser.  Watch out for permissions.
GNU Parted 1.7.1
Using /dev/sdb
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print

Disk /dev/sdb: 320GB
Sector size (logical/physical): 512B/512B
Partition Table: mac

Number  Start   End     Size    File system  Name     Flags
 1      0.51kB  32.8kB  32.3kB               primary
 3      134MB   320GB   320GB   hfs+         primary