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I am using virtualbox with

Host: Ubuntu 9.10 Guest Win 7

My old virtual disk was filing up so I added a new virtual disk. After I restarted the guest, I can not see it in the My computer. I can see a new disk in the device manager though. The new disk was added as primary slave.

What do I need to do to see it? I am guess I need to format the new virtual disk, but since I dont see any drive letter mapped to it, I am not sure of how to do this.

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You need to prepare the disk.

Take a look at this Microsoft guide that should walk you through what you need. If you just need to assign a drive letter see this guide.

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