Some more info:
Windows is installed on the same drive. When I launched Partition Magic
it complained about the LBA and CHS parameters for a partition on the
drive not being identical.
Just in case it's helpful..
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freebsd-stable@freebsd.org mailing
First of all, all low level diagnostic tools I've used on my drive show
no signs of hardware error. The shutdown prior to when the problems
started went smooth, without any error messages.
Yesterday GRUB would suddenly not display the boot menu anymore. After
some investigation I discovered that