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value out of range error on a disk with 40 GB FREE space

Hi,

I installed RHEL 6.0 OS on vmware with CREATE CUSTOM LAYOUT option. And I gave the space to different mount points as mentioned below:
/ 15360MB
/boot 200MB
/tmp 3072 MB
swap 1024 MB.

fdisk -cul command shows the disk size as 64.4 GB. But when I try to create partion of 10 GB with fdisk -cu command, it says "value out of range". When I created the partition with maximum possible space, it created the partion of 999 KB.

My question is where the remaining 40 GB space gone. And how can I create the partition of 10 GB space ?

Please see the sequence of the commands below:

[root@gauravclient Desktop]# fdisk -cul

Disk /dev/sda: 64.4 GB, 64424509440 bytes
255 heads, 63 sectors/track, 7832 cylinders, total 125829120 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0007fb86

Device Boot Start End Blocks Id System
/dev/sda1 * 2048 411647 204800 83 Linux
/dev/sda2 411648 31868927 15728640 83 Linux
/dev/sda3 31868928 36063231 2097152 83 Linux
/dev/sda4 36063232 125829119 44882944 5 Extended
/dev/sda5 36067328 38164479 1048576 82 Linux swap / Solaris
[root@gauravclient Desktop]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 15G 2.3G 12G 16% /
tmpfs 504M 100K 504M 1% /dev/shm
/dev/sda1 194M 24M 161M 13% /boot
/dev/sda3 2.0G 68M 1.9G 4% /tmp
/dev/sr0 2.8G 2.8G 0 100% /media/RHEL_6.0 i386 Disc 1

[root@gauravclient Desktop]#

[root@gauravclient Desktop]# fdisk -cu /dev/sda

Command (m for help): n
First sector (36065280-125829119, default 36065280):
Using default value 36065280
Last sector, +sectors or +size{K,M,G} (36065280-36067327, default 36067327): +10G
Value out of range.
Last sector, +sectors or +size{K,M,G} (36065280-36067327, default 36067327):
Using default value 36067327

Command (m for help): p

Disk /dev/sda: 64.4 GB, 64424509440 bytes
255 heads, 63 sectors/track, 7832 cylinders, total 125829120 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0007fb86

Device Boot Start End Blocks Id System
/dev/sda1 * 2048 411647 204800 83 Linux
/dev/sda2 411648 31868927 15728640 83 Linux
/dev/sda3 31868928 36063231 2097152 83 Linux
/dev/sda4 36063232 125829119 44882944 5 Extended
/dev/sda5 36067328 38164479 1048576 82 Linux swap / Solaris
/dev/sda6 36065280 36067326 1023+ 83 Linux

Partition table entries are not in disk order

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
[root@gauravclient Desktop]# partx -a /dev/sda
BLKPG: Device or resource busy
error adding partition 1
BLKPG: Device or resource busy
error adding partition 2
BLKPG: Device or resource busy
error adding partition 3
BLKPG: Device or resource busy
error adding partition 4
BLKPG: Device or resource busy
error adding partition 5
[root@gauravclient Desktop]# mkdir /test
[root@gauravclient Desktop]# mkfs.ext4 /dev/sda6
mke2fs 1.41.12 (17-May-2010)
Filesystem label=
OS type: Linux
Block size=1024 (log=0)
Fragment size=1024 (log=0)
Stride=0 blocks, Stripe width=0 blocks
128 inodes, 1020 blocks
51 blocks (5.00%) reserved for the super user
First data block=1
Maximum filesystem blocks=1048576
1 block group
8192 blocks per group, 8192 fragments per group
128 inodes per group

Writing inode tables: done

Filesystem too small for a journal
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 23 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
[root@gauravclient Desktop]# blkid /dev/sda6
/dev/sda6: UUID="f2acf882-697e-42b9-abb6-30eb15166ec8" TYPE="ext4"

[root@gauravclient Desktop]# vim /etc/fstab

[root@gauravclient Desktop]# mount -a

[root@gauravclient Desktop]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda2 15G 2.3G 12G 16% /
tmpfs 504M 264K 504M 1% /dev/shm
/dev/sda1 194M 24M 161M 13% /boot
/dev/sda3 2.0G 68M 1.9G 4% /tmp
/dev/sr0 2.8G 2.8G 0 100% /media/RHEL_6.0 i386 Disc 1
/dev/sda6 999K 17K 931K 2% /test

[root@gauravclient Desktop]#
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