Disk utility and reformatting for an external portable hard drive

I bought a brand-new iomega ego portable hard drive (USB compatible). When attempting to format it, I went to 'disk utility' to erase the drive. The drive appears, with the following information listed: Mount Point : /Volumes/Iomega HDD Capacity : 465.8 GB (500,105,217,024 Bytes)
Format : Winows NT Filesystem Available : 465.7 GB (500,022,378,496 Bytes)
Permissions Enabled : Yes Used : 79.0 MB (82,838,016 Bytes)
Number of Folders : 0 Number of Files : 32
Obviously, it needs to be reformatted. But when I click the erase tab, it will not allow me to pick the volume format or name (it just has it listed but unselectable).
Any suggestions on using disk utility or reformatting the drive so I can use it will be useful!

The drive has been pre-formatted for NTFS. You need to do the following:
Extended Hard 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. Set the number of partitions from the drop down menu to one. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to APM then click on the OK button. Click on the Partition button and wait the process has completed.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.

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