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Which drive do you want to manage?
- 1 TB WDC WD1001FALS: this is your internal hard drive, where you have OS X. If you choose this, you will be able to verify and repair the partition map and create partitions, among other things.
- Macintosh HD: It is inside the internal drive and it is where you have OS X. You can verify and repair permissions, and verify the disk to look for problems.
- 3 TB iomega: This looks like a FireWire external drive.
- Mac Companion: This is the partition inside the external drive