Thread: Ubuntu installation doesn't detect windows 7 installation and hard drive partitions

hello

had installed ubuntu 11.10 alongside windows 7 before. reasons, decided remove both , install them again. after removing both operating systems, installed windows 7.now want install ubuntu 11.10 alongside windows. doesn't detect windows 7 installation , doesn't detect hard drive partitions. shows error while trying install inside windows.

i'm running ubuntu using "try ubuntu". shows 1 disk partition unknown size.
when open gparted, shows whole hard disk 1 unallocated disk drive.

tested following commands in terminal:

code:

sudo sfdisk -lus && sudo fdisk -l

and result:

code:

disk /dev/sda: 77825 cylinders, 255 heads, 63 sectors/track warning: extended partition not start @ cylinder boundary. dos , linux interpret contents differently. units = sectors of 512 bytes, counting 0     device boot    start       end   #sectors  id  system /dev/sda1   *        63 285555374  285555312   7  hpfs/ntfs/exfat /dev/sda2     207493118 1250258624 1042765507   f  w95 ext'd (lba) /dev/sda3             0         -          0   0  empty /dev/sda4             0         -          0   0  empty /dev/sda5     285555438 495267884  209712447   7  hpfs/ntfs/exfat /dev/sda6     495267948 579159314   83891367   7  hpfs/ntfs/exfat /dev/sda7     579159378 830817539  251658162   7  hpfs/ntfs/exfat /dev/sda8     830817603 1250258624  419441022   7  hpfs/ntfs/exfat  disk /dev/sdb: 1020 cylinders, 239 heads, 62 sectors/track units = sectors of 512 bytes, counting 0     device boot    start       end   #sectors  id  system /dev/sdb1   *        62  15114359   15114298   b  w95 fat32 /dev/sdb2             0         -          0   0  empty /dev/sdb3             0         -          0   0  empty /dev/sdb4             0         -          0   0  empty  disk /dev/sda: 640.1 gb, 640135028736 bytes 255 heads, 63 sectors/track, 77825 cylinders, total 1250263728 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: 0x7f53b447     device boot      start         end      blocks   id  system /dev/sda1   *          63   285555374   142777656    7  hpfs/ntfs/exfat partition 1 not start on physical sector boundary. /dev/sda2       207493118  1250258624   521382753+   f  w95 ext'd (lba) partition 2 not start on physical sector boundary. /dev/sda5       285555438   495267884   104856223+   7  hpfs/ntfs/exfat partition 5 not start on physical sector boundary. /dev/sda6       495267948   579159314    41945683+   7  hpfs/ntfs/exfat partition 6 not start on physical sector boundary. /dev/sda7       579159378   830817539   125829081    7  hpfs/ntfs/exfat partition 7 not start on physical sector boundary. /dev/sda8       830817603  1250258624   209720511    7  hpfs/ntfs/exfat partition 8 not start on physical sector boundary.  disk /dev/sdb: 7743 mb, 7743995904 bytes 239 heads, 62 sectors/track, 1020 cylinders, total 15124992 sectors units = sectors of 1 * 512 = 512 bytes sector size (logical/physical): 512 bytes / 512 bytes i/o size (minimum/optimal): 512 bytes / 512 bytes disk identifier: 0x00068368     device boot      start         end      blocks   id  system /dev/sdb1   *          62    15114359     7557149    b  w95 fat32

i beginner ubuntu , don't know do.
please me overcome problem.

gparted shows disk unallocated when there problem or corruption in partition table.
can take @ fixparts can scan disk , small repairs if necessary. better backup data first.
http://www.rodsbooks.com/fixparts/

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