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as you did before ~ OS X Extended for Time Machine, ExFAT or Free space for Windows. I am a bit surprised you are having issues because your iMac and OS X version suggests that the drive is most likely formatted using the GUID/GPT partition scheme which Windows 7 should have no issues with reading.Actually, being curious I just tested it with Lion and Windows 7 (no bootcamp):I partitioned a drive with one OS X Extended partition, one ExFAT using the GUID partition scheme and Windows detected the ExFAT partition right away.Maybe it's a derp from bootcamp? Anyway, the options you were reading up on are most likely the solution to your problem.Since you only used Time Machine so far and Windows couldn't even access the drive I assume you have no problem with formatting the drive again losing all data currently stored on it?Go into Disk Utility, select the external drive and click on the partition tab.
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