Installation of Bliss OS 15.9 in Legacy Bios mode

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The following commands were used to unpartition and convert the disk to MBR in command prompt -
diskpart - launches the disk part utility
list disk - lists all the connected disks
select disk n - sets or assigns the disk for further usage (where n represents the disk number)
clean - deletes all the partitions available on the disk
convert mbr - sets the boot sector of the disk to MBR