Como reparticionar o disco rígido para instalar o novo sistema operacional?

Question

Eu instalei o ubuntu 16.04 e a memória do meu disco rígido de desktop é de 1TB. O problema é que eu sou pouco familiarizado com a parte da memória que eu deveria reformatar para que eu possa instalar outra versão do Linux e do Windows.

Disk /dev/loop0: 4 MiB, 4222976 bytes, 8248 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/loop1: 83 MiB, 87080960 bytes, 170080 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/loop2: 83.1 MiB, 87089152 bytes, 170096 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

Untitled Document


Ignoring extra data in partition table 5.
Ignoring extra data in partition table 5.
Ignoring extra data in partition table 5.
Invalid flag 0xf640 of EBR (for partition 5) will be corrected by w(rite).
Disk /dev/sda: 465.8 GiB, 500107862016 bytes, 976773168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0xc227991d

Device     Boot      Start        End    Sectors   Size Id Type
/dev/sda1             2048   39530495   39528448  18.9G 83 Linux
/dev/sda2         39532542 1953535999 1914003458 912.7G  5 Extended
/dev/sda5       1129402482 1438994829  309592348 147.6G 37 unknown


Disk /dev/sdb: 465.8 GiB, 500107862016 bytes, 976773168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/sdc: 465.8 GiB, 500107862016 bytes, 976773168 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/isw_bjehdcdacf_RAID5: 931.5 GiB, 1000210694144 bytes, 1953536512 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 65536 bytes / 131072 bytes
Disklabel type: dos
Disk identifier: 0xc227991d

Device                                 Boot     Start        End    Sectors   Size Id Type
/dev/mapper/isw_bjehdcdacf_RAID5-part1           2048   39530495   39528448  18.9G 83 Linux
/dev/mapper/isw_bjehdcdacf_RAID5-part2       39532542 1953535999 1914003458 912.7G  5 Extende
/dev/mapper/isw_bjehdcdacf_RAID5-part5       39532544   43483135    3950592   1.9G 82 Linux s
/dev/mapper/isw_bjehdcdacf_RAID5-part6       43485184  104857599   61372416  29.3G 83 Linux
/dev/mapper/isw_bjehdcdacf_RAID5-part7      104859648 1953535999 1848676352 881.5G 83 Linux

Partition 2 does not start on physical sector boundary.
name@name:~$ Disk /dev/sda: 465.8 GiB, 500107862016 bytes, 976773168 sectors
No command 'Disk' found, did you mean:
 Command 'risk' from package 'xfrisk' (universe)
Disk: command not found

Eu adoraria receber sugestões de qual unidade devo reformatar para poder ter mais espaço livre e instalar outro sistema operacional, onde o sistema operacional atual não será afetado.