External hard drive has no available space even though i have deleted nearly everything on there

I have an external hard drive for backups and it has no available space even though i have deleted nearly everything on there. Where is the space?

Drive Preparation
1. Open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed.

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    So could I take everything off my external hard drive, save it to my Mac, then re-format it for my Mac and move everything back to the external hard drive?
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