Problem installing ISO in a multi partitioned USB

[Hemant Joshi]

I am trying to install an ISO image into a partition in a multi-partitioned USB pen drive.
I have used Windows version of UNetBootin successfully in past. So I know how to use.
Since the Windows version of UNetBootin does not support multi-partition USB pen drive, I decided to use the Linux version (latest downloaded from the site). And I used Ubuntu-10.04-i386 desktop as my Linux platform (where I ran UNetBootin).
My USB pen drive has three partitions:
/dev/sdc1 - size 1MB -Left Unformatted.
/dev/sdc2, /dev/sdc3 - size bigger than what is needed for the iso.

Started UNetBootin and selected ISO image (one of those listed at the site and is confirmed to be working when installed on Windows).

Problem 1 -
Selected drive /dev/sdc2 for the image installation. During installation/copying process, UNetBootin complained about insufficient disk space. So I clicked the dialog box, to ignore and continue copying. I trired this step 2nd time with double size partition. However the problem did not go away. So I am not sure whether the process of was actually successful or not.
I could see almost all files copied into the partition. The status of Unetbootin shows that all the steps were successful.

Problem 2 -
After rebooting received a dialog box that "no bootable image found". So I booted via Gujin boot manager in a CD drive.
Gujin too did not find any bootable image in the pen drive.

Problem 3 -
Where does UNetBootin install it's boot loader/manager in the drive?
Is it MBR or root of the partition (/dev/sdc2 in my case)?
I think it is MBR where UNetBootin installs it's own boot manager/loader. If so UNetBootin should provide following options to the user:
1. Whether to install UNetBootin's boot manager/loader?
2. If yes, where to install - MBR or PBR(root of the desired Partition).

The above options are useful even when installing an OS into HDD.

I prefer Gujin boot manager installed into MBR.
Hence Gujin was preinstalled in the Pen drive, before I started UNetBootin. I am sure about preinstalled Gujin should not cause any problem to UNetBootin.

Thanks,
Hemant

[Hemant Joshi (hemantnjoshi)]

I forgot to mention that the /dev/sdc2 and /dev/sdc3 were both formatted as FAT32, prior to using it with UNetBootin.