addpart

Tell the kernel about the existence of the specified partition

$ addpart [device] [partition] [start] [length]

addpart device partition start length

addpart tells the Linux kernel about the existence of the specified partition. The command is a simple wrapper around the "add partition" ioctl.
This command doesn't manipulate partitions on a block device.

device The disk device.

partition The partition number.

start The beginning of the partition (in 512-byte sectors).

length The length of the partition (in 512-byte sectors).

The addpart command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/.

delpart(8), fdisk(8), parted(8), partprobe(8), partx(8)