When I sync unknown error pops up

Make sure that your 'C:' drive has enough "free" disk-space (64GB if you have a 64GB iPod Touch) to make a backup.

If you do, then use iTunes to "reset" the iPod to its "factory" settings, and then it will sync your iTunes Library to the iPod.

I think the cache folder is causing the problem. Check this out.
http://www.itjungles.com/iphone-tips/fixed-error-the-ipod-cannot-be-synced-an-unknown-error-occurred-13019-on-iphone-3gs

Try the link below that applies to your computer OS:

http://support.apple.com/downloads/iPod_Reset_Utility_1_0_3_for_Mac
http://support.apple.com/downloads/iPod_Reset_Utility_1_0_4_for_Windows

Useful troubleshooting-video:
http://www.apple.com/support/ipod/tutorials/troubleshooting.html

Good luck!

Hi There!! Im having some trouble with my iPod i'd love any help i can get! I have a 30g iPod and it has trouble syncing. When i plug it in it, it only syncs around 195.5mb of songs, even though its capacity is 30g. There is nothing else on it. When its taken in this amount of music

I accidently lock the ipod and i forget how to unlock

I am now having the same plroblem. Error -48 code keeps popping up

send a message to apple telling them your problem or go to their site and look under trouble shooting!

hi dear

Following is list of iPod and iTunes Error messages or Alert messages you may come across while trying to open or install iTunes, update, sync or restore iPod, making a purchase from iTunes Store, or perform any other activity in your iPod/iTunes:

1. "Unable to Check for Purchased Music because an error occurred (-5000 error)."
2. "Error (-35)"
3. "There was an error in the iTunes Store. Please try again later."
4. "-5000" and "-35"
5. “Error 1415” “Error 208” “Error 1418” “Error 1413” “Error 1427” “Error 200” “Error 1402” “Error 50” “Error 1406” “Error 1407” “Error 1428” “Error 1417” “Error 60” “Error 42” “Error 48” “Error 39” “Error 1417” “Error 53” “Error 69” “Error 50” “Error 3221””Error 2738” “Error1921” “Error 1607” “Error 5000” “Error 9006” “Error 9800” “Error 9814” “Error 9815”
6. "Failed to locate Supported File Types or There Are No Photos Found on this Device"
7. "the iPod ** cannot be updated, the required folder cannot be found"
8. "Cannot connect to the iTunes Store. An unknown error has occurred”
9. “Disk is locked”
10. "iTunes folder cannot be found"
11. “Disk cannot be read from or written to”
12. “Firmware update failure”
13. “Drive not formatted”
14. "The iPod "username's iPod cannot be updated. The required folder cannot be found"
15. "Folder cannot be found or created"
16. “Attempting to copy to the disk [iPod name] failed. The disk could not be read from or written to.”
17. "Sync failed: unknown error (-124)"
18. "iPod cannot be synced: required folder cannot be found"
19. “iPod Service Error”
20. “Cannot Import to Itunes - error 2002”
21. "Attempting to copy to the disk (iPod name) failed. The disk could not be read from or written to"
22. “The iPod "Customer's iPod" could not be restored. An unknown error occurred (1418)”
23. "The iPod "Customer's iPod" cannot be updated. An unknown error occurred (-50)"
24. “iTunesSetup.exe is not a "valid Win32 application"
25. "Internal manager error”
26. “iTunes 7.02 not a valid Win32 application”
27. "itunes.exe - Corrupt File"
28. "An Unknown Error occurred (-39)"
29. "Could not complete your iTunes Store request. The store may be busy. Check your Internet connection or try again later."
30. "There was an error downloading your purchased music. An unknown error occurred (-50)."
31. "-9800, -9815, -9814"
32. "Unable to Check for Purchased Music because an error occurred (-5000 error)."
33. "There was an error in the iTunes Store. Please try again later."

If you come across any one of the above Error or Alert messages, then either your iPod/iTunes has gone corrupted and your iPod may be in for a crash or maybe you’re already facing an iPod crash. iPod might crash or get corrupt due to any of the reasons from hardware failure to corrupt iPod cache to damaged Files or to damaged disk structure.

You must be cautious and try to recover lost data from your iPod from reliable and proved software which is non-destructive and can recover all data—damaged or deleted. Any compromise can thwart your recovery process. Try Stellar Phoenix iPod Recovery Software.

from this site

http://www.ipoddatarecovery.net/download-ipod-recovery-software.php

oke

well im not sure on how to fix your sync problem but there are ways to get your songs back just go on google or apple.com and youll see billions of diffrent answers but you just have to find the right one

Error 1416 is very similar to 1418 (you might actually get the latter if you try it again). Try following the directions found here. Does the iPod have any other problems (syncing or anything else)? What changed since the last time you restored it (if you ever did)? Also, try disabling your internet security software.