Mavericks external hard drive seagate

I went from 10.6.8 to 10.9.2 yesterday, upgrading my Mac book Pro to Mavericks.
yesterdag my brand new Seagate external hard drive (2 T) worked just fine on the 10.6.8 system
Now My Mac Book Pro doesn't even see it! In the forums I see many people suffer simular problems. What to do?
It seems like data is not lost (I checked by connecting the external hard drive to another computer).
Anybody?
M.

A NFTS formatted drive should be visible on your MBP and allow you read too it but not write. You will need a third party application such as Tuxera or Pargon NFTS installed in order to write to it.
The drive can be reformatted in Disk Utility>Erase to Mac OS Extended (Journaled) which will make it totally Mac compatible , but all user on the HDD will be deleted.
Have you checked your MBP Finder Preferences>General?
Ciao.

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Hello,
"Thinking of reformatting it back to be used to Mac and Windows. And not use it again with Time Machine"
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When I drag the iphoto icon
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Suer as long as it is formatted Mac OS extended (journaled)
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Triple-click anywhere in the line below to select it:
tmutil compare -E
Copy the selected text to the Clipboard (command-C).
Launch the Terminal application in any of the following ways:
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Thanks for your reply. I agree about the communication issue. Let me explain my setup and what I am trying to do and perhaps you can answer my questions or make suggestions.
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Mavericks external hard drive seagate

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