Mountain Lion 10.8 no longer recognizes external drives

I just upgraded to 10.8 and my two external drives are no longer recognized (either in Finder or the desktop). One is a Drobo raid drive and the other is a Seagate 2 TB external drive. Both have been working fine for years under the previous OS version but are not recognized by 10.8. I have rebooted both the iMac and the drives but nothing shows up. Drobo provides a desktop dashboard that does see the Drobo drive and reports no errors. I use both drives for backups which no longer works since the drives are not recognized. Any suggestions?

Yes, both there.. but 'repair disk permissions" and "verify disk" are greyed out on Drobo and all are greyed out on the Seagate.

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