[ubuntu] partitions disappeared fdisk wont work

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http://ubuntuforums.org – Im having a problem with gParted because it shows that my whole hardrive is unallocated when in fact I can boot into ubuntu and linux mint i can also mount my linux mint, lubuntu and xp partitions from within Ubuntu. Ive been looking around and i haven't found anything that helps I've tried Code: sudo fdisk -l and it says fdisk: unable to seek on /dev/sda: Invalid argument I can still see the partitions uuid if i use blkid the blkid results are as follows Code: /dev/sda2: LABEL="Windows XP" UUID="9CD8FCBED8FC982A" TYPE="ntfs" /dev/sda5: LABEL=" (Hardware)