enable disk use to get a drive letter
--- full guide
1. Insert your iPod to the USB port.
2. If your Windows PC still doesn’t have iTunes installed, skip this step. If iTunes is already installed and prompt a message on whether if you’d like to associate this iPod with this computer and deleting its content, click No. Or else you will lose your only copy of library on iTunes. Beside, ensure that ‘Enable Disk Use’ is selected.
3. Open My Computer or Windows Explorer, the iPod should be automatically detected as a portable hard drive.
4. Click on the iPod icon or the iPod portable hard drive letter to open the contents of the drive.
5. If you don’t see a folder called “iPod Control”, it’s hidden and invisible. To unhide it so that it’s visible, go to Tools -> Folder Options -> View tab, and then check (enable) the option “Show hidden files and folders.” (FOR VISTA: If you have Vista and you don't see a menu, then go to Organize -> Folder and Search Options -> View tab, and then check (enable) the option "Show hidden files and folders."
6. Open the “iPod Control” folder, and then the Music folder. (For the movies, there should be a seperate folder called Movies. If not, then it should be in the Music folder.)
7. The Music folder contains the iPod’s music and videos, divided into folders. Copy the library to local computer hard drive’s My Music folder.
8. The files copied have unintelligible four-letter file names. Don't worry, you do not need to rename the songs. To reveal the names of the songs and other data tags, copy the songs from the Music folder to iTunes. iTunes will automatically rename all of the songs.
