Answer Posted / uma

[root@station4 ~]# parted
GNU Parted 1.8.1
Using /dev/hdb
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted) print


Model: ST380215A (ide)
Disk /dev/hdb: 80.0GB
Sector size (logical/physical): 512B/512B
Partition Table: msdos

Number Start End Size Type File system Flags
1 8225kB 26.2GB 26.2GB primary boot
2 26.2GB 26.4GB 206MB primary ext3
3 26.4GB 28.5GB 2097MB primary linux-swap
4 28.5GB 80.0GB 51.5GB extended
5 28.5GB 44.3GB 15.7GB logical ext3

(parted)q

The parted command displays the total size of the disk & the
space allocated to partitions. The remaining space (size)
not allocated to partitions is the unallocated space

OR

# fdisk -l ==> to view the size of the disk
# df -h ==> to view the size of the partitions

The remaining (balance) size is the unallocated size

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