Some partitions not detected

[1991sudarshan]

My friend was using Windows 7 and it crashed suddenly, after that he installed Windows XP, and he was not able to access some partition which were detected by windows. Then we tried live os using Ubuntu 11.10. Some partitions were not detected by ubuntu and gparted disk utility shows those partition as Unknow filesystem.

I checked the fstab blkid and here are the results. We need to retrieve the data from the partitions before formating them. Please give some guidance

Thanks

ubuntu@ubuntu:~$ sudo fdisk -l

Disk /dev/sda: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders, total 625142448 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: 0x000b69bb

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *      206848   102402047    51097600    7  HPFS/NTFS/exFAT
/dev/sda2       102402048   204795903    51196928    7  HPFS/NTFS/exFAT
/dev/sda3       204796620   625137344   210170362+   f  W95 Ext'd (LBA)
/dev/sda5       204796683   409593239   102398278+   7  HPFS/NTFS/exFAT
/dev/sda6       409593303   625137344   107772021    7  HPFS/NTFS/exFAT
ubuntu@ubuntu:~$ 
ubuntu@ubuntu:~$ sudo blkid
/dev/loop0: TYPE="squashfs" 
/dev/sda1: UUID="CE40C59D40C58CA1" TYPE="ntfs" 
/dev/sda6: LABEL="Entertainment" UUID="3E76339676334E41" TYPE="ntfs" 
/dev/sdc1: LABEL="TRANSCEND" UUID="96F4-CC43" TYPE="vfat"

ubuntu@ubuntu:~$ cat /etc/fstab
overlayfs / overlayfs rw 0 0
tmpfs /tmp tmpfs nosuid,nodev 0 0
ubuntu@ubuntu:~$ mount
/cow on / type overlayfs (rw)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
fusectl on /sys/fs/fuse/connections type fusectl (rw)
udev on /dev type devtmpfs (rw,mode=0755)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
/dev/sr0 on /cdrom type iso9660 (ro,noatime)
/dev/loop0 on /rofs type squashfs (ro,noatime)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
tmpfs on /tmp type tmpfs (rw,nosuid,nodev)
none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
none on /run/shm type tmpfs (rw,nosuid,nodev)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev)
gvfs-fuse-daemon on /home/ubuntu/.gvfs type fuse.gvfs-fuse-daemon (rw,nosuid,nodev,user=ubuntu)
/dev/sdc1 on /media/TRANSCEND type vfat  (rw,nosuid,nodev,uid=999,gid=999,shortname=mixed,dmask=0077,utf8=1,showexec,flush,uhelper=udisks)