I encountered a vexing problem right about the time I got my Nokia 5310. My Thinkpad T60 won’t write to the phone when connected as a storage device. I thought it was a phone problem and I asked Nokia Support for help but as expected, they weren’t really able to help. Meanwhile, I was stuck using Bluetooth to transfer files. No fun. Later, I noticed that my external hard drives, card readers, and generally USB storage devices don’t work either. I tried searching for a solution and eventually I found it. You just need to use the registry editor to delete the key HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\StorageDevicePolicies\WriteProtect. Voila! I can now write to USB storage devices. How that key got into my system registry, I don’t know. Another one of the many wonders of Windows.