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A b-tree node error has caused my macbook (Mavericks) to crash. Disk Utility and /sbin/fsck -fy do not fix the problem. So, I am running Ubuntu 12.04 LTS live on a USB stick in an effort to grab my files. However, when I run lsblk, I get the following:

ubuntu@ubuntu:~$ sudo lsblk -o NAME,FSTYPE,SIZE,MOUNTPOINT,LABEL
NAME   FSTYPE     SIZE MOUNTPOINT LABEL
sda             232.9G            
├─sda1 vfat       200M            EFI
├─sda2          232.1G            
└─sda3 hfsplus  619.9M            Recovery HD
sdb    iso9660    7.5G            Ubuntu 12.04.3 LTS amd64
├─sdb1            200M            
└─sdb2            7.3G            
sr0              1024M            
loop0  squashfs 666.6M /rofs 

That sda2 partition without an FSTYPE is where my files are located.

Using fdisk yields the following:

ubuntu@ubuntu:~$ sudo fdisk -l

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


Disk /dev/sda: 250.1 GB, 250059350016 bytes
255 heads, 63 sectors/track, 30401 cylinders, total 488397168 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/sda1               1   488397167   244198583+  ee  GPT

As you can see, fdisk doesn't even show the sda2 partition.

Can I do anything about this?

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