Can't see external drive after Leopard installation

Hi there, i hope i'm i the right place! I have just installed Leopard on my Intel iMac 1.83ghz, 2gb ram, 160gb HD and it no longer sees my external Maxtor One Tough 3 HD. Disk utility says it doesn't recognise it. I have checked the Seagate site for a Leopard update for Intel Macs but nothing yet.
Any ideas anybody?
Cheers
Lou

also at:
http://discussions.apple.com/message.jspa?messageID=5717128#5717128
Apparently turning off the password security on the drive from a 10.4 machine has fixed it for at least some people w/this symptom.

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