There have been quite a number of posts about such issues, but never seen this one before. After I bought my USB external drive (a 1TB Toshiba Stor-E), my laptop recognized it fine, copied files onto it, etc. Then I plugged it into my other laptop, recognized it, used it. Since then, however, my first laptop won't recognize it. It won't show up under MyComputer, under Device Manager, not even under Disk Management. Troubleshooting steps tried: tried to get it recognized with 'add new hardware', under Device Manager 'look for hardware changes', ticked 'view hidden devices', removed USB hubs and let Windows re-recognize them, installed Windows 7 on laptop (previously it had XP), ran drivercleanup I found in one of the threads, looked for lower- and upperfilters in registry, nada. This morning I formatted the entire internal hard drive and reinstalled Windows XP just for kicks... nada. It still won't recognize it, while it is working fine with my second laptop. The computers that recognize the drive both have XP on them. Any ideas?