I have 2 Questions on Formatting a New External Hard drive

Both questions are probably easy but I've searched and can't find the answers.
1. When I open Disk Utility there are two icons for each hard drive, one with the brand name (LaCie) and the other with the size and other info for the drive. Which do I use to format or run the disk permissions repair tool?
2. The new hard drive is formatted MS DOS which I understand will work but I think I need to change it to an HFS+ format, the options are:
Mac OS Extended (Journaled)
Mac OS Extended
Mac OS Extended (Case Sensitive & Journaled
Mac OS Extended (Case Sensitive)
I have no idea what the difference in these are. I don't plan to partition the drive as it's just a mini-drive to put my iTunes and iPhoto Libraries on.

1. If you don't plan on partitioning the drive, either can be used. To partition the drive, you need to select the drive itself instead of the disk.
2. The journaling option will keep a log of changes made to the disk; this may make it easier to recover data from the drive if you run into problems with it later. This option can be changed without erasing the drive again. The case sensitive option preserves the case of letters in filenames; for example, A1 and a1 are identical when the case sensitive option is off, but not when it is on. Changing the case sensitive option requires erasing the disk.
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