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I've recently bought a Mac, and I want to share my Seagate FreeAgent 1.5 TB external hard drive with both my Mac and my PC. I've searched and found that exFAT or UDF is the way to go to have read/write access on both platforms. I've gone with UDF (I've read that exFAT is better for flash drives and it is also proprietary hence no official linux support -- if I ever need it just in case) and when I plug it in the Windows (where I formatted it as UDF) it works fine. When I plug it into my Mac, it says the drive can't be read and offers me to format it or eject it. When I go to disk utility, it shows the drive formatted as exFat (no I'm sure it is not. It is UDF, I formatted it from the command line with UDF option and it shows as "UDF" under Windows). I try to verify/repair the disk and here is the screenshot of what I get:

error

What could be the cause of the problem and how can I solve it?

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Well firstly, trying to repair it won't work if it's wrongly detecting it. I'd wipe the drive, and format it under OS X as UDF, and see if that works. –  user3463 May 22 '12 at 22:37

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I'm working on this right now. The command line tools are there, but I can't figure out how to automount a UDF drive.

sudo mkdir /DriveName  # Don't put in /Volumes, so we don't interfere with the automounter
sudo mount /dev/disk2s1 /DriveName
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