External Hard Drive (Samsung) not recognised since I updated to Mavericks

Hi,
Since I updated to Mavericks I can't see my external Samsung HD when I plug it in. It's lit up and my ports are working fine. I can however see that it is listed under 'Disk Utility' -  butwhat do I need to do so that I can use it again?
Any advice much appreciated.
On Disk Utility it says I have options of either Repair or Verify Disk - is that what I need to do? Sorry - tech noob here.
Thanks

catchands wrote:
On Disk Utility it says I have options of either Repair or Verify Disk - is that what I need to do? Sorry - tech noob here.
Yes, first Verify and then Repair.
Ciao.

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