gentoo@livecd ~ $ sudo parted
GNU Parted 3.1
Using /dev/sda
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) p
Model: ATA WDC WD5000LPVX-2 (scsi)
Disk /dev/sda: 500GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags: pmbr_boot

Number  Start   End     Size    File system     Name    Flags
 1      1049kB  3146kB  2097kB                  grub    bios_grub
 2      3146kB  265MB   262MB   ext2            boot
 3      265MB   4561MB  4296MB  linux-swap(v1)  swap
 4      4561MB  500GB   496GB   ext4            rootfs

(parted)