Im trying to transfer info from one external HD to an other, how can you reformatt again?

Macs use a different file system than Windows. If you format the disc on the Windows computer, both computers should be able see your data.

@ratboy that’s the problem, since I formatted it on my iMac bow the vaio will not pick it up. Is there a way to reverse this??

You have to format it as FAT32 or NTFS if you want Windows to see it. No ifs, ands, or buts. Windos cannot deal with HFS, HFS+, ext3, ReiserFS, or basically anything that Microsoft didn’t write themselves. There is also no way to change the file system without wiping the drive, or at least having a very high risk of doing so.

Your best bet is to back up the stuff you need, format the drive on a Windows machine, and go from there.

Have you tried the disk tool in the Admintrative Tools folder? If that doesn’t help, try Swissknife.

I only know the PC environment. I would, in the interest of speed, install the hard drive(s) to my desktop tower, offload the data to a folder (directory) on another drive with sufficient room on it (hopefully you have this) then I would reformat the drives that were in the external housings and then load them with the desired data. I would then put the hard disks where I wanted them.

I still don’t understand why you just move (swap) the external drives to where you want them.

I want to thank everyone that helped out. Decided to just swap info into a zip drive and then just transfer it into my Mac.