I installed Ubuntu 12.10 32bit with the intention of using it to share hard drives across an office of Windows 7 computers. I've set up an initial share on the hard drive Ubuntu was installed from with no issues - Windows can see, read and write to this drive. I did this using the GUI (Right click > Properties > Share) and a small amount of editing Samba's preferences.

My problem came when I added a second drive. I've formatted it as ext4 and mounted it, and shared it through the right click menu as before.
However, though Windows can see the folder, when I try to access it I get a "Windows cannot access..." permissions message. This only happens on the second drive.

If it's of any help, here's my fdisk -l:

    Disk /dev/sda: 1000.2 GB, 1000204886016 bytes

255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 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: 0x000b4feb



   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *        2048  1928376319   964187136   83  Linux

/dev/sda2      1928378366  1953523711    12572673    5  Extended

/dev/sda5      1928378368  1953523711    12572672   82  Linux swap / Solaris



WARNING: GPT (GUID Partition Table) detected on '/dev/sdb'! The util fdisk doesn't support GPT. Use GNU Parted.





Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes

255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 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: 0x00000000



   Device Boot      Start         End      Blocks   Id  System

/dev/sdb1               1  1953525167   976762583+  ee  GPT

It's the disk at "dev/sdb1" I'm attempting to share.

I also tried manually adding this to my fstab, but this doesn't change things one way or the other:

# /etc/fstab: static file system information.

#

# Use 'blkid' to print the universally unique identifier for a

# device; this may be used with UUID= as a more robust way to name devices

# that works even if disks are added and removed. See fstab(5).

#

# <file system> <mount point>   <type>  <options>       <dump>  <pass>

# / was on /dev/sda1 during installation

UUID=8aea5b44-a5f0-4d0e-8e22-53c3838a8ede /               ext4    errors=remount-ro 0       1

# swap was on /dev/sda5 during installation

UUID=5d4ac6d9-a9a1-4ed6-bee5-ab72fed15b12 none            swap    sw              0       0

/dev/sbd1 /media/revolution/data ext4 defaults 0 0

Any help would be greatly appreciated.