Trying to format an Iomega 1TB for mac

I got two 1TB drives from radio shack and can't get them to format to mac. Both were stuck saying something about a 4k block for more than an hour, I thought it was suppose to tell me how much time was remaining? After quitting disk utility on both drives each one says "the disk you inserted was not readable by this computer". Disk utility gives me an error when I try to format it again and an error when I try to repair or verify. I'm using disk warrior to rebuild it but that has went over night and is still stuck on step 1. So I have a few questions
1) how long should a format take with a 1TB drive?
2) how long should disk warrior take to rebuild a 1TB drive?
3) have I totally screwed up these drives?

How did you go about reformatting? I've had the format fail if I didn't change the partition table. However, I don't know if that is a universal problem.
You must go to the Partition tab and click on the options button to change the boot record to either GUID Partition Table (GPT) or Apple Partition Map (APM). GPT is for Intel machines and APM is for old PowerPC machines. Either will work for read/write, but you have to use the correct format if you want it bootable.

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Hi. Trying to connect iomega ext. HD. i have to reformat for Mac. When i plug in & go to Disk Utility,the external shows up and i'm supposed to click "partition". When i do, a box comes up saying ""Disk Utility has lost its connection with the Disk Management Tool and cannot continue. Please quit and relaunch Disk Utility." I quit and relaunched, same results. After googling my question, i came up with this:
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cheers
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