a - fdisk fdisk is used to manage partition tables on HDD/SDD/devices You can create, delete, resize partitions... change their types or even check their status fdisk -l → lists the partition tables of your devices fdisk -l /dev/sda → lists the partition tables for sda device fdisk -s /dev/sda → prints the size of sda partition fdisk /dev/sda → press m → shows all the disk commands
b - create, delete and change partition type with fdisk to create partition: fdisk /dev/sda → press n → press p for primary or extended → choose the partition number → enter first and last sector for this partition → w to write the changes to delete partition: fdisk /dev/sda → press d → select partition number → w to write the changes to change partition type: fdisk /dev/sda → press t → then L to list the partition types → enter the partition number you want → w to write the changes to quit without writing the changes: q You can also create new empty partition table : b → for GPT, o → MBR, G → for SGI and s → Sun