I had ths problem with a slightly smaller HDD but I cured it by doing this. Go to 'Control Panel', select 'Administrative Tools' and from there select 'Computer Management'. A box opens and on the left select 'Storage' and then 'Disk Management'. From here you should be able to see your lost...
I had a similar problem and cured it by re-setting my BIOS. I know you said you had done this - but how long before the problem started and is there any possibility that you may have got a virus?
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