usb disk uuid change

[Bouki]

Hello there
I want know my usb disk uuid and then change it.
How can I do this ?
help me please.

[mikewhatever]

You can use tune2fs for both:

To find out the current UUID

sudo tune2fs -l /dev/sdXY | grep UUID

for example, in my case

$ sudo tune2fs -l /dev/sda2 | grep UUID
Filesystem UUID: 41d737a7-b449-4b4e-a6de-d9c1d096e31a

...and to change the UUID

sudo tune2fs -U [UUID] /dev/sdXY

see man tune2fs for more info.

[Bouki]

Thanks a lot man.
but

when i use this command
sudo tune2fs -l /media/disk | greb uuid
this error happen:
couldnt find the valid filesystem superblock.
where is the problem?
and how can fix it?

[BkkBonanza]

tune2fs is for ext filesystem devices not a mounted directory. You need to give it /dev/sd.. something.

Try typing, mount to see a list of what devices are mounted where.

[Bouki]

i used this command:
dev/sd mount
but no such file or directory funded!
i think my usb disk format is not valid.
its my first time using linux .
please help.

[BkkBonanza]

You need to first do,

mount

by itself, this will list current mounts. Then in that list find which device is mounted on /media/disk.

It will look like this, eg.

...other stuff...
/dev/sdc1 on /media/disk type vfat ... etc...
...

Once you see which device, here /dev/sdc1 then you can use the tune2fs command, eg.

sudo tune2fs -l /dev/sdc1 | grep UUID

Make sure you use the actual /dev/sd.. that you see on yours. You must get all the details right or you will get error messages.

[mikewhatever]

Bouki, check out the output of sudo blkid. That should show all the partitions with their UUIDs.

[Bouki]

Thanks a lot guys.
where is the problem?
dear BKK
http://www.forumimagecodes.com/images/6uct0z0tltdja0iavak_thumb.png (http://www.forumimagecodes.com/viewer.php?file=6uct0z0tltdja0iavak.png)
dear mike:
http://www.forumimagecodes.com/images/8hj2un4i2n53s5d2jnif_thumb.png (http://www.forumimagecodes.com/viewer.php?file=8hj2un4i2n53s5d2jnif.png)

[mikewhatever]

/dev/sdb1 is probably the partition on the usb disk. May I ask why you want to change its UUID?

[Bouki]

is this necessary?
i want use the uuid for my new softeware license.
i captured the screens and uploaded in http://www.forumimagecodes.com/ but now its not working!!!!!!

[mikewhatever]

Still not sure why you want that fat32 filesystem UUID changed, but, anyway, tune2fs is obviously not the tool.
Try this howto instead: http://ubuntuforums.org/showthread.php?t=1240146

[Bouki]

thanks again.
i red that guide.
it work. but i need hexeditor.
how can find it?