External HD won't mount

[imac abuser]

Hello,
I have an iMac with several external HD's only one of them will not mount. I'm not sure why it's self powerd (plugged in the wall). I have boot camp installed, 2 maxtor hd's and then the problem child Acomdata HD (used to be hooked up to a mac mini that's no longer in service.

I'm trying to organize two itunes libraries into one, but can't seem to get that drive to mount any tips?

 

[emt1]

Stop abusing your iMac and maybe it will mount all of your external hard drives? Sorry, couldn't resist! Does the drive show up in Disk Utility?

 

[imac abuser]

haha no i figured out what it was i had i plugged in via usb but it should have been firewire. it has a built in hub and was connected wrong

 

[gusious]

In what format is it?