I am running Win7 32bit Professional on an Acer 8930 notebook. I have various USB storage solutions - including a 32MB flash stick and 2 usb external drives with 320mb drives - all of which work with no problem. I also have a media player which uses an internal 2GB Western Digital hard drive for recording/storing media. The media player connects to the notebook using USB for transfer of files, and up until a week or two ago this also worked perfectly and I could connect it to the notebook and transfer large ISO files (DVD @4.7Gb and BluRay at 47Gb) with no problem. Suddenly a couple of weeks ago the player was stuttering on playback of HD files on the TV, so I connected it to the notebook using USB to find the drive had developed problems - it was reading very slowly and would not reformat. The Western Digital diagnostics showed there were drive errrors so I returned it to Western Digital and it was replaced under warranty. Today I connected the new drive to the Notebook using an esata connection and formatted it (2GB again). I transferred a file to it, put it in the media player and then connected it to the TV again. I recorded 2 minutes of TV and was able to play it back as well as playing the transferred movie off the drive. I then re-connected the Media Player to the Notebook using USB to transfer the rest of my media files - but the drive was not recognized by the notebook (ie it did not show up in Windows Explorer). I disconnected it and re-connected and it was seen this time. However as I copied a large bluray iso file (43GB) at about 13% Explorer displayed an error saying the drive was not ready and I had to abort copying. Now the drive was no longer recognized until I disconnected and re-connected again. This pattern has now been repeated several times and Windows 7 keeps dropping the USB connection, but only to this drive - it has no problem with the external 350gb drives which are constantly recognized. Any suggestions regarding possible resolution to this problem would be greatly appreciated.