Can't Mount Windows 8 Partition

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http://ubuntuforums.org – Hi, My windows 8 crashed, i installed Ubuntu 13.04 on another partition however, i can't access windows 8 files and i get this error whenever i try to mount Error mounting system-managed device /dev/sda1: Command-line `mount "/mnt/94CCA009CC9FE430"' exited with non-zero exit status 13: ntfs_attr_pread_i: ntfs_pread failed: Input/output error Failed to read NTFS $Bitmap: Input/output error NTFS is either inconsistent, or there is a hardware fault, or it's a SoftRAID/FakeRAID hardware. In the first case run chkdsk /f on Windows then reboot into Windows twice. The usage of the /f para (Hardware)