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I have an USB disk drive partioned with 2 FAT32 partitions, which is not getting detected in the embedded device, but gets detected in a Fedora system.

Basically in the udev rules, I am not able to get the UUID of the USB disk. Is it possible to have a filesystem FAT32/NTFS to exist without having UUIDs?

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blkid generates a UUID for the filesystem. As far as I know, it always generates something sensible and reproducible. Your problem is unrelated to UUID: it seems that the drive or its partitions aren't detected on your embedded device. What unix variant is it running? What is the output of cat /proc/partitions, and do you recognize the drive there? Do any messages appear in the system logs when you plug in the drive? What is the output of fdisk -l /dev/sdX where sdX is the block device (probably sdb or sdc)? What about udevadm info -a -n sdX? –  Gilles Dec 20 '12 at 23:31
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