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RE: 2 Physical Drives -> One Logical Drive
4GB and 16GB? Either you are living in the 90s or you must be using the very first SSDs ever made. Wow.
The RAID option has been well covered by previous posters and it isn't a great option for you. There are a couple other ways you can use the smaller 4GB drive that you should consider:
1) It's about the right size for a swap / temporary file drive. A few Google searches can tell you how to set that up.
2) Starting with Windows 2000, you are not limited to drive letters. You can attach a volume to any folder on another volume (e.g. "My Documents" under your user profile) and it becomes that folder. UNIX users will be familiar with this concept. It can create the user view of having a single file system that you want, but unlike RAID, it's not truly a single volume. The folder the other drive is mounted as will be limited to the size of that drive and there will be some free space reporting issues (the parent drive won't factor it in when reporting its free space). Other than that, this is very handy and surprisingly underused.
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