I have an external drive with two partitions. Partition #1 is fine. Partition #2 appears on the "Devices" section on the left of a finder window, yet nothing appears when I click on it. Disk Utility shows 125GB used out of 150GB total. It is described as "USB External Physical Volume OS X Extended". Luckily this is an old backup disk that probably doesn't have anything important on it but it would be nice to know. Any ideas?