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I am running Ubuntu 10.10. on an Acer Aspire laptop alongside windows 7. I left my laptop on the battery which clearly ran out- and now neither windows nor ubuntu will load (I am currently running ubuntu off a USB stick). On the USB stick I can see the windows partition and access the files, but I can't even see the ubuntu partition- I don't think it is mounted.

In the device manager I have no option to mount it, I can format it but when I try, nothing happens.

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Try this in a terminal:

dmesg | grep sda

Can you access the hard disk?

sudo cfdisk /dev/sda

Maybe your ubuntu partition is already mounted:

mount | grep sd
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[ 4076.613216] EXT4-fs (sda7): mounted filesystem with ordered data mode. Opts: (null) – Jordan Jan 17 '12 at 21:24

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