It appears that the USB is only writing sporadically to the TomTom and I have no idea why.

I have just experienced the same problem.

I have a new windows 7 64 bit ultrafast machine with high speed cable..... map update still has 4 hours to go !!!  grrrrrr

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I'll experienced the same with a new Via120 Europe(first on XP, then on W7). It takes more than 7 hours to get the update and new maps!  it is still running. In the same time I'll download a lot more gigabytes. Why is this update slow?,

I have currently the same problem : purchased ont Tomtom site the update of my Europe South map + suscribed 1 year (+ bonus 6 m) updates for approx 60 euro. Started to download yesterday evening : the more the download progressed, the more the "time remaining" indication went up. At one moment, it showed... 6458 hours !! Interrupted during the night, restarted this morning at 08.30 am (showing a time remaining forecast of more than 7 hours) and after 6.30 hours download, the time remaining is still of ... 5.15 hours (if not disconnected). Meanwhile, 60 euros have been already "uploaded" from my account. I have read all the posts regarding this topic and I do not understand why and how a company like Tomtom does not bring any answer and/or solution to this...

I called tech support awhile back and they said it was most likely a hardware error, even though I said it was all over the forum pages that this is a problem.  The technical support lady said that mine was two years old and probably ready for replacement.  I said to spend that much money every few years is ridiculous.  I was able to update the map by manually moving each file from the computer to the TomTom one at a time, tedious I know, but it does work.  You must be sure to copy the activation files as well, one at a time.  Good luck!  I now just tend to use my smartphone for any GPS needs.

I'm having the same problems - it's definitely an I/O error - tomtom Home keeps dieing and even windows explorer is failing to copy them on. I've just spent £65 ish on map updates and now my TomTom's a brick as I can't even put the old map files back.

Are you updating to an SD card or to the built-in memory? I have found it takes much longer to update to the memory card that I installed so that I could save more features on my One XLS.  But I have no solution. I have a fiber optic broadband connection and run Windows 7 64 bit on a fast machine. I've learned to do it overnight.

I have the same problem with my XL 310. It takes >12 hours to copy to internal memory after downloading the update. I have tried both a Vista and a Windows 7 x64 machine. No help from TomTom yet.

The real question is why doesn't TOMTOM monitgor these forums and chime in with a response!