You plug your iPod into your Mac using the sync cable and sync songs to your iPod through iTunes.
If not an iOS device, you must sync with computer, then sync with other iPod.
if the info is not on the computer then it will not sync with the ipod , itouch ,iphone there is no way yet of restoring the ipod of this mess
You have to move all your music from your windows computer to your mac. When you plug in your iPod (with iTunes open) it should ask if you want to sync to this library instead of the other one. This will wipe everything on your iPod and replace it with whatever is in your iTunes library.
Connect it to a PC or mac and sync it with iTunes
To sync your iPod with your iTunes, to load music, or even videos and games to your iPod product, you need to use the USB adapter which you get inside the box. You put the dock side of the adapter into your iPod, and the USB 2.0 side of the adapter into your PC/Mac, then iTunes should manually load unless you chose it not to. It will then automatically start syncing it. It's recommended that you do not manually sync your iPod without using iTunes by using My Computer and locating the iPods disk drive.
When you plug your iPod into your computer and open iTunes, it should sync your music automatically. If not, you can click on your iPod icon on the left hand side of your screen, and then there is a icon that says sync on the bottom right hand corner so you can sync your ipod that way.
If you sync your iPod with a Mac, you'll only be able to sync it with a Windows if you reformat it to be compatible with Windows. In other words, you can only use your iPod with one OS at a time.
You have to plug your iPod into your computer/mac and do it from there.
It should sync automatically, but if it doesn't remove your Ipod from the computer, close Itunes, and try again. If that doesn't work, re-connect your Ipod to the computer, and re-open Itunes. Then click on your Ipod's name and click Sync.
You go to your iPod touch's applications and press sync
No. You can only Sync from one computer, no matter what operating system it is.