To protect the copyrights of the songs, musics and videos stored on iPod and reduce piracy, Apple has make it difficult to copy or transfer the songs, music, audio, videos and files that stored on iPod to personal computer (PC) or laptop notebook computer, by scrambling the file names of the songs on the iPod and telling the operating system that the files should be invisible to normal users, without any encryption involved in this iPod anti-copying mechanism.
iTunes allows only one-way synchronization of musics from computer to iPod, so if for whatever reasons such as need to reload your library on local hard disk due to desktop hard disk failure or buying new computer, you can easily finish iPod Music Transfer by following steps:
1. Insert your iPod to a Windows PC USB or FireWire port. (PC should runs Windows XP or other Windows operating system).
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 unhidden it so that it’s visible, go to Tools -> Folder Options -> View, and then check (enable) the option "Show hidden files and folders."
6. Open the "iPod Control" folder, and then 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. To reveal the names of the songs and other data tags, add the files to the Windows Media Player or iTunes libraries or switch to "Tiles" view in Windows Explorer.
9. Rename the file if necessary.
Beside above manual ways to copy and transfer music from iPod to computer, or import into iTunes, there is third party program called iPod Music Transfer that has the iPod copying function such as Cucusoft iPod to Computer Transfer.
With iPod Music Transfer, you can quickly and easily transfer iPod music and videos to computer. Apart from that, importing and exporting photos from iPod to computer is supported as well. For your convenience, iPod Music Transfer supports display all information of iPod music on the main interface such as version, type, serial number, capacity and format.
with this iPod music Transfer, you can manage your iPod without itunes between any computer, free annoyance of iPod synchronization.

You can refre to this guide:
How to Transfer Music from iPod to Computer?
How to transfer music from ipod to itunes?
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