Please provide OS information first. Commands and options for fdisk utility varies from OS to OS. Here's what I would do on a RHEL system to create 30MB partition!
Code:
[root@testserv-sl6 ~]# fdisk /dev/sdb
WARNING: DOS-compatible mode is deprecated. It's strongly recommended to
switch off the mode (command 'c') and change display units to
sectors (command 'u').
Command (m for help): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
Command (m for help): p
Disk /dev/sdb: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00092e03
Device Boot Start End Blocks Id System
/dev/sdb1 1 244 1953125 83 Linux
Partition 1 does not end on cylinder boundary.
/dev/sdb2 244 487 1952768 83 Linux
Partition 2 does not end on cylinder boundary.
/dev/sdb3 487 730 1952768 83 Linux
Partition 3 does not end on cylinder boundary.
/dev/sdb4 730 1045 2529280 83 Linux
Command (m for help): d
Partition number (1-4): 1
Command (m for help): d
Partition number (1-4): 2
Command (m for help): d
Partition number (1-4): 3
Command (m for help): d
Selected partition 4
Command (m for help): p
Disk /dev/sdb: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00092e03
Device Boot Start End Blocks Id System
Command (m for help): n
Command action
e extended
p primary partition (1-4)
p
Partition number (1-4): 1
First cylinder (1-1044, default 1): 1
Last cylinder, +cylinders or +size{K,M,G} (1-1044, default 1044): +30M
Command (m for help): p
Disk /dev/sdb: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00092e03
Device Boot Start End Blocks Id System
/dev/sdb1 1 5 40131 5 Primary
Command (m for help): w
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LEARN ABOUT OPENSOLARIS
addpart
ADDPART(8) System Administration ADDPART(8)NAME
addpart - tell the kernel about the existence of a partition
SYNOPSIS
addpart device partition start length
DESCRIPTION
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.
PARAMETERS
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).
SEE ALSO delpart(8), fdisk(8), parted(8), partprobe(8), partx(8)AVAILABILITY
The addpart command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/.
util-linux January 2015 ADDPART(8)