Fifth-generation iPods (with video) failing to complete synchronization using USB 2.0

A growing number of users are reporting an issue where the fifth-generation iPod (with video) fails to synchronize properly over a USB 2.0 connection.

In most cases, the synchronization process will stall part-way through (after having transferred a portion of the library). When this happens, the iPod will not properly eject, and iTunes becomes unresponsive. In severe cases, Mac OS X hangs completely, and a manual restart is required.

Users may also receive the error message "Attempting to copy to the disk (name of iPod) failed. The disk could not be read or written to."

In our iPod special report, we noted issues transferring large data files via USB 2.0 on various iPod models. In virtually all cases, users are able to workaround the problem by using FireWire transfer instead of USB 2.0. Of course, fifth-generation iPods do not have FireWire capabilities, so this is not an option for these models.

Indeed this does appear to be a problem with the USB 2.0 controller inside fifth-generation iPods, as indicated by the fact that (as discussed below) adding an externally powered USB 2.0 hub to the mix is the most effective solution.

There are a few other workarounds you should try before purchasing a hub, however, to make sure other factors are not at play.

Getting stuck on certain tracks -- try re-encoding Some corrupt or otherwise problematic MP3s can cause issues when synchronizing between an iTunes library and an iPod.

Try converting any MP3s in your library to AAC format using the "Convert selection to AAC" command, in iTunes' "Advanced" menu.

Getting stuck on photos -- try disabling photo transfer Some users report that the synchronization process stalls when transferring photos. If this affects your system, try temporarily disabling photo synchronization and check for persistence of the problem.

Enable hard disk mode A handful of users have reported that turning on hard disk mode for their iPod provides alleviation of this issue.

This can be accomplished by selecting your iPod in the iTunes source list, then clicking the iPod icon in the lower-right corner of the main iPod window. Check the box next to "Enable Disk Use." After doing so, disconnect your iPod, re-connect it and check for persistence of the issue.

Try using a USB 2.0 hub As aforementioned, the most effective solution for most instances of this problem is the addition of an externally powered USB 2.0 hub, to which the problematic iPod should be connection.

Externally powered USB 2.0 hubs can be had for about US$30 at most retailers.

Replacement units working for some Meanwhile, some users have had success with replacement iPods, obtained through Apple. Failing the above workarounds (including use of a USB 2.0 hub), seeking a replacement is probably your best bet.

Feedback? Late-breakers@macfixit.com.

See our iPod special report (which covers all currently shipping and discontinued iPod models) for more information.

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