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I've loaded from the USB stick with Debian Live CD on it to fix the MBR after a Windows installation.

Suddenly I've found that fdisk -l shows nothing but the live USB itself. What would it mean?

I've used this image: http://cdimage.debian.org/debian-cd/current-live/i386/iso-hybrid/debian-live-6.0.5-i386-xfce-desktop.iso

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Are you running fdisk -l as root? If so, are there any strange messages in dmesg? – Chris Down Nov 9 '12 at 21:45

Chris Down was right; I wasn't running with root permissions

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