Ext disk volume still says "MS-DOS (FAT)" after erase/partition?

Hi, and thanks in advance. I have actually searched here, read quite a bit including the FAQ on using an ext drive with Time Machine (what I'm trying to do) but am still not clear.
I'm bringing over a 500G ext drive from my PC to my new iMac. I've used Disk Utility (I thought) to erase the drive, and form a single new partition.
When I click on that partition, the Volume info appears correct: it is Mac OS Extended (Journaled) and named Backup Book. However, if I click on the drive itself (with size and ID info) that still is listed as a MS-DOS (FAT) volume, and is untitled.
I'm doing a giant "huh" here, even with all my searching, so will be grateful for any assistance. Should I expect this behavior? If not, where did I go wrong? Thanks again.

Do this:
Extended Hard Drive Preparation
1. Open Disk Utility in your Utilities folder. If you need to reformat your startup volume, then you must boot from your OS X Installer Disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger or Leopard.)
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, 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. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID (for Intel Macs) or APM (for PPC Macs) then click on the OK button. Click on the Partition button and wait until 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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Ext disk volume still says "MS-DOS (FAT)" after erase/partition?

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