few possibilities

1) your thumbdrive is encrypted
2) your thumbdrive is contains multiple partition which xbox cannot regconise
3) your thumbdrive is formatted in a format unrecognizable by xbox
4) your thumbdrive is faulty
5) your xbox usb port is faulty
6) your xbox just doesn't like your thumbdrive
7) you actually stuck your thumb in instead of a usb drive

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Added on June 28, 2010, 2:25 pmor you can try to update via online instead of going thru d thumbdrive

latest dashboard update contains the usb drive updates

This post has been edited by greyshadow: Jun 28 2010, 02:25 PM

ya... fat32 only
ntfs doesn't work