My 1.5 TB MyBook frustrated me under Windows 7, eSATA, (but worked under Windows XP w/eSATA, and Windows 7 w/Firewire) until I upgraded the firmware to 1.034. After tje firmware upgrade, MyBook has been stable under Windows 7 w/eSATA. Don’t assume that your drive has that January 09 update simply because it came w/ August 09 software. I purchased my drive from Best Buy in November 09, and the drive included August 09 software, but the firmware was still the 1.028 version. You can view the firmware of your MyBook by checking its properties in Windows 7’s device manager applet (Start>run> type in “device manager” in the search box and select the program that Windows 7 finds). Somewhere in the drive’s properties, you’ll see the name “MyBook” followed by a string of letters, numbers, and other characters. I’m not near my PC right now, but that string will include something like “1028” or “1_028” if you have the 1.028 firmware and “1034” or “1_034” if you have the 1.034 firmware.
You can download the 1.034 firmware at http://support.wdc.com/product/download.asp?groupid=111&sid=99&lang=en. Make sure to follow the instructions on that page. I had problems running the update until I closed several background programs and reran the update program. EndItAll 2, free software available at http://www.docsdownloads.com/Tier1/enditall.htm provides a fast, simple method of closing background programs. Before running EndItAll 2, manually close any background programs that include “exit” or “close” commands in their interface. Then, when using EndItAll 2, select “Close Programs” rather then “Kill Programs” to minimize potential stability issues.
Once last point. Western Digital’s Drive Manager does not function w/eSATA. The capacity meter that Drive Manager provides is nice, but not essential, and I wouldn’t give up the added speed of eSATA for that function.