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I have an external HD mostly used in my Win7. But I transfered some files to it using Ubuntu 12, and now it isn't being reconized in my Windows. I am being prompted to format the HD.

What can I do?

Thanks in advance!

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I would reboot into Linux to see if it's a formatting issue or hardware issue... If Linux reads it see what the formatting is (type mount) and go from there. – nerdwaller Mar 7 '13 at 2:36
Changing the partition type requires a partition manager and root privileges. Ubuntu definitely doesn't do this on its own. How to Repair a Damaged Partition Table or MBR might help you. – Dennis Mar 7 '13 at 2:38
I have sometimes found ntfsfix to be helpful in this situation. I haven't ever had it happen with Windows 7, though. – user55325 Mar 7 '13 at 2:58
@user55325 and others, but I'm using Win7 right now, I wont have access to any Linux for a long time – Marcelo Assis Mar 7 '13 at 3:06
If you really think that Ubuntu formatted the partition, try installing an ext2 file system driver for Windows - or will do the trick of mounting the drive in Windows. If however the drive is corrupted these will not help you - a Linux boot CD and Dennis' link is your best bet. – Aaron D Mar 7 '13 at 5:31

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