Can't mount 1tb External HDD - error message

Hello,
First of all, I wasn't sure exactly where to post this, so please let me know if it should be moved.
Als, I have done pretty extensive searches on this problem ad error message but all the results were about 2 years old - i'm posting now in the hope that someone has some new answers!
I have a Macbook August 2007 model, and I have been using a Iomega 1TB external hardrive with no problems for the last year, until yesterday..
I can only think that I might have been too quick to take out the usb cable after ejecting it or the mac was too slow responding after I clicked to eject - I was running iMovie HD at the same time, which seems to slow things down. Now it will not mount, though I can see it in Disk Utility. I'm gutted if this is what caused it because I am so meticulous about ejecting it properly!!
When I tried to verify and repair, I got the following error code:
Verify and Repair disk “ABBY'S 1TB”
** /dev/disk2s1
** Phase 1 - Read FAT
Unable to read FAT (Input/output error)
Error: The underlying task reported failure on exit
1 non HFS volume checked
1 volume could not be repaired because of an error
I'm not technical enough to know which way it has been formatted, sorry.. but I just looked on Disk Utility and it says 'MS-DOS File System (FAT32)' .. I don't know what FAT and HFS mean...
I heard that if i try to mount it on a PC, it might work and then I could copy everything to dvds and try to reformat it.. is this a good option? I don't actually have a pc, I have used Macs for years, but I could wait til next week and find one to use..
But if anyone has any tips on how I can try to repair it or recover the lost data, I'd be really happy to hear from you.
Thanks,
Abby
Message was edited by: Abigail Lawson

Hey there Shaun7036,
It sounds like you are unable to mount your external USB drive when you connect it to your Mac and you have already reformatted, and repaired it. I would next reset your SMC and then your PRAM.
Shut down the computer.
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer. 
Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/ht3964
Then:
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
After resetting NVRAM or PRAM, you may need to reconfigure your settings for speaker volume, screen resolution, startup disk selection, and time zone information.
About NVRAM and PRAM
http://support.apple.com/kb/ht1379
Thank you for using Apple Support Communities.
Take care,
Sterling

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