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I was trying to install a dual boot in my PC (I have Windows 7 Installed Already), it does not recognize my partitions, I even left non allocated space and nothing, it saw it as a free disk. Then i run gparted in Ubuntu live CD an this is what showed me:

/dev/sda contains GPT signatures, indicating that it has a GPT Table. However it, does not have a valid fake msdos partition Table, as it should.Perhaps it was corrupted possibly by a program that doesnt understand GPT partition Tables.Or Perhaps you Deleted the GPT table, and are you using ,sdos partition table. Is this a GPT partition Table?

And no matter what i respond to that yes/no , it shows me like if i had a blank Drive.

Please help.

This is the result of sudo fdisk -l:

Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0xaeb663d7

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *        2048      206847      102400    7  HPFS/NTFS/exFAT
/dev/sda2          206848   221825519   110809336    7  HPFS/NTFS/exFAT
/dev/sda3       221827072   567169023   172670976    7  HPFS/NTFS/exFAT
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  • Did you convert a Windows 8 in UEFI to Windows 7 in BIOS boot mode. Windows does not convert correctly and leaves backup gpt partition table. Then Linux tools get confused. But if you have Windows 7 in UEFI boot mode do not do this. You can remove backup gpt table with fix parts. rodsbooks.com/fixparts Also how many partitions do you have MBR(msdos) only allows 4 primary partitions and you must use one as the extended partition.
    – oldfred
    Mar 3, 2015 at 4:40
  • Go to a terminal (Ctrl+Alt+T) and run: sudo fdisk -l and edit your question with the output. (That's lower case -L, not -1). You might have some leftover GPT data that needs to be removed on a MBR formatted disk (see here)
    – bcbc
    Mar 3, 2015 at 5:49

1 Answer 1

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Your partition table is damaged, or at least quirky enough for parted to not know how to deal with it. It looks like you've probably just got stray GPT data, which is easily removed by fixparts (part of the gdisk package in Ubuntu). See this page or the FixParts documentation for further details.

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