Question about fdisk command

shariefbe · 12-15-2009, 11:19 PM

Hi i am trying to do partition in my SD card. for that i tried

my device name is sdb1. but it says

Code:

ariem@ariem-desktop:/dev$ fdisk /dev/sdb1

Unable to open /dev/sdb1

I dont know what will be the problem. Please help me

syg00 · 12-15-2009, 11:25 PM

/dev/sdb - fdisk deals with devices.
Probably need sudo on Ubuntu.

shariefbe · 12-15-2009, 11:32 PM

Yes thank you. Now it works fine. I partitionaed my SD card. ANd it shows the out for "print the partition table" is

Code:

Disk identifier: 0x00000000

     Device Boot      Start         End      Blocks   Id  System
/dev/sdb1p1               1           4        8032+  83  Linux
/dev/sdb1p2               5          11       14112   83  Linux
/dev/sdb1p3              12         956     1905120   83  Linux

Command (m for help):

Now in what file system this partitions are. And how to change the file system of each partition.
When i open /media/disk i am not seeing any partitioned part. Just it shows all the things. what is wrong?

pixellany · 12-15-2009, 11:44 PM

"unable to open" means you need to be root---or use sudo.

Once you have the right privileges and try to do fdisk on a partition, THEN it will tell you--among other things--that there are no partitions. (I don't know what would happen if you attempted to create some.----On my system, it's acting like it is quite willing to try.....

)

pixellany · 12-15-2009, 11:46 PM

After creating partitions, you then have to create a filesystem on each one using mkfs. Then, you have to mount the partitions to use them.

shariefbe · 12-15-2009, 11:50 PM

That command i know. But i am confused how to use that.
Sorry i partitioned only one partion into three. Now i partitoned the whole disk into three partition
Now i partitoned the whole disk. see the partition table

Code:

Disk identifier: 0x00000000

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1           4        8032+  83  Linux
/dev/sdb2               5          11       14112   83  Linux
/dev/sdb3              12         957     1907136   83  Linux

Now how to change the file system for each partion?
i want to change
first partition as RAW
Second partition as FAT32
Third as EXT3
What are the command i have to give change the file system of each partition. I am confused. Please help me

shariefbe · 12-16-2009, 12:09 AM

I think i changed the file system sdc2 and sdc3 partitions. see the output. is this changed

Code:

root@ariem-desktop:/dev# mkfs.ext3 /dev/sdc3
mke2fs 1.41.4 (27-Jan-2009)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
119280 inodes, 476784 blocks
23839 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=490733568
15 block groups
32768 blocks per group, 32768 fragments per group
7952 inodes per group
Superblock backups stored on blocks: 
	32768, 98304, 163840, 229376, 294912

Writing inode tables: done                            
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 31 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.
root@ariem-desktop:/dev# mkfs.vfat /dev/sdc2
mkfs.vfat 3.0.1 (23 Nov 2008)
root@ariem-desktop:/dev#

But i am getting my disk in /media. just i am geeting my device names in /dev file system. why it is like this?is there any wrong?

pixellany · 12-16-2009, 12:09 AM

To create filesystems on your partitions: "mkfs"

"man mkfs" for details

Is "RAW" a filesystem?? (Never seen that before)

pixellany · 12-16-2009, 12:14 AM

Devices are in /dev

To access a device, you have to mount it. The typical locations are /mnt and /media, but you can pretty much mount a device anywhere you want.

Suppose you have sda3 (formatted with a standard filesystem) and you wnat to access it using a new node named "/media/mystick":

Code:

cd media
mkdir mystick
mount /dev/sda3 mystick
cd mystick
ls     ## to see what's there

shariefbe · 12-16-2009, 12:35 AM

Simple thing. Now i have 2Gb SD card. I want to make 3 partitions in that and i have to change the file system of each partition. 2nd partion as FAT32 and 3rd partion as EXT#. 1st partion no need to change the file system. now what are all the commands used to create and change the partition file system. Now my device name is /dev/sdd

pixellany · 12-16-2009, 08:13 AM

Your question has already been answered here!!!

Did you look at the man page for "mkfs"?

sumeet inani · 12-16-2009, 08:29 AM

Why don't you use gparted utility to create desired partitions.

In ubuntu you can run
$sudo apt-get install gparted
For fedora
#yum install gparted

Run gparted as superuser to see all devices & their corresponding filesystem detected that is
#gparted &
It would be another case if you insist on using basic commands.

Just trying to help.If you find this post useful then thank me by pressing thumbs up button.Thank You.

pixellany · 12-16-2009, 08:50 AM

At one point, the OP said that he already HAD partitions and just wanted to format with filesystems.

Regardless, this thread now contains complete instructions for partitioning AND formatting....