addpart

Tell the kernel about the existence of a partition

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

addpart device partition start length

addpart is a simple wrapper around the "add partition" ioctl that notifies the Linux kernel about a partition that exists on disk but was not detected automatically. This is useful when partition tables are modified while the disk is in use, or when the kernel's partition scanning missed an entry during boot.
The command only updates the kernel's in-memory partition table; it does not create or modify the actual partition table on disk.

device

The block device containing the partition (e.g., /dev/sda)

The partition number to add

The starting sector of the partition

The length of the partition in sectors

This command only informs the kernel about partitions; it does not create or modify the actual partition table on disk. Use tools like fdisk or parted to modify partition tables.

Part of the util-linux package, which provides essential system utilities for Linux.

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