"Device can not be read from or written to" error keeps coming up...

I have recently updated to the 3.1 firmware on my iPhone 3G (after a couple failed attempts).
The problems seemed to start there when the update froze midway through and I had to try a couple more times. After I did and restored my settings, iTunes said that my backup file didn't work. I tried a couple more times to restore from the backup but ended up having to restore as a new device.
Now, as I try to sync all of my, well, everything, I keep getting an error message.
It synced all of my contacts, apps, calendar, etc., but when it gets to my music and videos it will sync a bit of it before giving me the error messages:
"Cannot sync ___, the required disk is not found"
and immediately after,
"Device can not be read from or written to."
I've tried syncing my iPhone many times, and these errors keep coming up.
What should I do?

Hi,
This article: http://support.apple.com/kb/HT1207 provides tips that will resolve issues causing this message to appear with iPhones and iPods.
Make sure the iPhone is directly connected to a high-speed USB2 port on the PC, using the cable that came with it.
-Jason

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Symptoms
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Products Affected
iPhone, iPod with color display, iPod photo, iPod nano, iPod nano (2nd generation), iPod (5th generation), iPod (5th generation Late 2006), iPod touch, iPod classic, iPod nano (3rd generation)
Resolution
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Need a little help from the experts.
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iTunes recognizes iPod
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Hey there,
And Welcome to Apple Discussions.
Have you had a chance to look at this Apple support document relating to this exact issue? If not, I would check it out. Make sure to work through each troubleshooting solution one at a time. Could be of help.
[Disk cannot be read from or written to when syncing iPod or Firmware update failure error when updating or restoring iPod|http://support.apple.com/kb/HT1207]
Otherwise, I would try completely formatting the iPod through Windows and then restoring it through iTunes. Instructions on how to do this can be found below. Its worth a shot.
[Erase Your iPod - The Super Fix for Most iPod Problems|http://www.methodshop.com/gadgets/ipodsupport/erase/index.shtml]
Hope this helps.
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Just doublechecking. In the course of your troubleshooting to date, have you worked through the following document?
["Disk cannot be read from or written to" when syncing iPod or "Firmware update failure" error when updating or restoring iPod|http://support.apple.com/kb/HT1207]

"Device can not be read from or written to" error keeps coming up...

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