Cant Unmount New external HaRD DRIVE

[gone.fishing1]

Unable to Use TIme Machine to backup a new Western Dig external 1 TB drive. It is connected through an adaptor to my Firewire 800 using a Firewire 400 with adaptor. I cant dismount the drive to reformat it to MAC using disk format utility. Any suggestions.

 

[DoFoT9]

Unable to Use TIme Machine to backup a new Western Dig external 1 TB drive. It is connected through an adaptor to my Firewire 800 using a Firewire 400 with adaptor. I cant dismount the drive to reformat it to MAC using disk format utility. Any suggestions.

does it say "the drive cannot be ejected because its in-use"????

 

[gone.fishing1]

No, it does not appear as "in use". The utility will not allow me to erase or reformat drive

 

[DoFoT9]

No, it does not appear as "in use". The utility will not allow me to erase or reformat drive

oh i see. in the partition tab, hit "Options" and make the hard drive a "GUID" partition table... see how that goes..