160GB iPods Classic won't mount in iTunes or Finder.

I have 4 Classic 160gb iPods.Two were working fine until I tried adding a new playlist of mp3 stories. About ½ way through they each disconnected. After trying to get 'em to work, I reformatted them using disk utility. Now, when I plug 'em in, all either one does is mount for a second then unmount. Not enough time to do anything with them.

Music is set to manually synch only.

Safe Mode has same results.

Disk mode - both mount, then dismount in <1 second.

My 4th iPod has never been used, so I mounted it with the OE never used cord and it worked & loaded fine.

Used the new cord on the two failed ones makes no difference.

Here's the disk diagnosis ...