MacOS – Can’t read the Windows (Boot Camp) partition from OS X


I have a Boot Camp problem. Both OSes boot correctly, but when I'm in OS X, I can't access my Windows partition and vice versa. I know that I can't write, but it should be able to read. But I can't access the partition at all.

In disk utility, I can see a disk0s4 grayed out where my Boot Camp disk should be.

To add, I tried to go with a 3 partition setup (OS X, Windows 7 and a data disk). This is after a clean Lion installation.

Here are additional details on my setup in case it helps narrow things down:

  1. Installed a clean version of Lion after installing a new HDD.
  2. Using Boot Camp assistant to install/setup Windows partition.
  3. Before installing Windows 7 I created a new partition.
  4. Restart and install Windows 7 from CD/DVD.

diskutil list shows:

  GUID_partition_scheme                        *750.2 GB   disk0   
                    EFI                         209.7 MB   disk0s1
              Apple_HFS OS X                    270.0 GB   disk0s2
              Apple_HFS DROPZONE                208.9 GB   disk0s3
   Microsoft Basic Data                         270.8 GB   disk0s4**

Best Answer

NTFS support was removed in Lion, follow below to re-add it (you should be able to write to the drive as well, after installation)

install and enable ntfs-3g:

and install fuse_wait: