Can't access my files on a drive

Partitions are formatted to NTFS, even if it is a single partition taking 100% of the available space it is still a partition. Windows incorrectly names partitions as drives. You can have a single drive in a system and create 2 partitions. Windows will show a 'C drive' and a 'd drive' which is wrong, there is only 1 drive, just 2 partitions.

Can you give the output of:

sudo fdisk -l; mount; echo; sudo blkid; lsb_rease -a

Thanks

here is fdisk -l, im not new to linux, and im not sure how to use other commands "mount; echo; sudo blkid; lsb_rease -a"

Disk /dev/sda: 203.9 GB, 203928109056 bytes
255 heads, 63 sectors/track, 24792 cylinders, total 398297088 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: 0x000cbc51

   Device Boot Start End Blocks Id System
/dev/sda1 2048 398295039 199146496 7 HPFS/NTFS/exFAT

Disk /dev/sdb: 150.0 GB, 150039945216 bytes
255 heads, 63 sectors/track, 18241 cylinders, total 293046768 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: 0x00057689

   Device Boot Start End Blocks Id System
/dev/sdb1 2048 293044223 146521088 7 HPFS/NTFS/exFAT

Disk /dev/sdc: 750.2 GB, 750156374016 bytes
255 heads, 63 sectors/track, 91201 cylinders, total 1465149168 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: 0x6ab70955

This doesn't look like a partition table
Probably you selected the wrong device.

   Device Boot Start End Blocks Id System
/dev/sdc1 ? 2048 1465145343 732571648 7 HPFS/NTFS/exFAT

Disk /dev/sdd: 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: 0xa206a206

   Device Boot Start End Blocks Id System
/dev/sdd1 * 2048 206847 102400 7 HPFS/NTFS/exFAT
/dev/sdd2 206848 625139711 312466432 7 HPFS/NTFS/exFAT

Ok, which partition is it?

With Wubi the host ntfs partition is mounted as /host

Alt-F2, /host (Ctrl+D to bookmark)

150 gb drive is the drive with my Ubuntu, 750 gb drive is the one i can't mount, and the 320 gb drive is the one that has Windows 7.

/dev/sdd has 2 partitions bacause one of them is system reserved for Win7
/dev/sdc is the one i cant mount

ah okay,

This is likely the problem:
"This doesn't look like a partition table
Probably you selected the wrong device."

As shown here:

Disk /dev/sdc: 750.2 GB, 750156374016 bytes
255 heads, 63 sectors/track, 91201 cylinders, total 1465149168 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: 0x6ab70955

This doesn't look like a partition table
Probably you selected the wrong device.

   Device Boot Start End Blocks Id System
/dev/sdc1 ? 2048 1465145343 732571648 7 HPFS/NTFS/exFAT

Well, yeah but it works perfectly in Win7, should i just try to format my drive from Ubuntu and see if that works?

Does it chkdsk as ok in Windows? If you safetly remove it in Windows then boot to Ubuntu and connect the device is it friendlier?. I also suggest you set then unset the boot flag in Windows too. Won't really affect stuff but it makes the situation less ambiguous

Windows tends to be less irritated by partition table errors. Ubuntu is uncompromising. I suppose it's possible that it's not considered an error in Windows but it's something unsupported in Ubuntu.

Re-partitioning will likely fix it - but if it's not empty this is pretty radical. It'd be better to install and run testdisk or fixparts and see if it can repair the damage.

http://www.cgsecurity.org/wiki/TestDisk (this is in the repos)
To install from command line (or use the Software Centre):
sudo apt-get install testdisk
To run:
sudo testdisk /dev/sdc

Or fixparts (not in repos):
http://www.rodsbooks.com/fixparts/