[ILUG-BOM] USB drive: size mismatch

I have an iball 256mb usb drive. I had previously installed slax on it and now want to install a later version. But when i formatted the drive with both fdisk and cfdisk they had both created 253mb partitions called sda1. But whenever i mount it df -ha shows that the partition is only 179mb. I have tried rebooting the computer since fdisk said the table would be read on next reboot but it fails. I am using suse 10, does the automounting as soon as a device is detected have anything to do with this problem

Thanks, Nikhil

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