Problem with external USB drive

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http://www.kubuntuforums.net – I'm having problems with a new external HDD. I already have 3 external HDDs (two USB and one FireWire) which I can mount using KDE Device Manager, no additional configuration was required to get them working. I prepared the new drive exactly the same as my other USB drives by re-formatting it to EXT4 using KDE Partition Manager. After formatting Partition Manger shows type as "unknown" and won't allow me to assign a label to the drive, however from the command line the drive shows as EXT4. I can mount the drive using device manager but there is no read/write access. Any i (HowTos)