On Saturday 25 Jul 2015 14:09:57 gottl...@nyu.edu wrote: > On Fri, Jul 24 2015, Paul Tobias wrote: > > On 23 Jul 2015 16:18, <gottl...@nyu.edu> wrote: > >> On Thu, Jul 23 2015, Paul Tobias wrote: > >> > On 23 Jul 2015 02:31, <gottl...@nyu.edu> wrote: > >> >> My new installation is running well, in particular it boots fine. > >> >> However the grub2-mkconfig seems odd. > >> >> > >> >> It finds linux (all kernels) and the stub windows partition. But > >> >> then > > > > I > > > >> >> get messages that both ext4-fs and FAT-fs have trouble with > >> >> /dev/sda4, which is the extended partition. Perhaps the fact that > >> >> the windows partitions sda[23] don't really have windows on them yet > >> >> is part of the answer?? > >> >> > >> >> Has anyone else seen something like this? > >> >> > >> >> thanks, > >> >> allan > >> > > >> > Maybe there was another partition on the disk around that location > > > > before > > > >> > and the file system signature is still lurking around? Run `wipefs > >> > /dev/sda4`, that will show you which signatures are there. > >> > >> Wow what a command name! When I first read your msg I had a double > >> take, since wiping (i.e., erasing) /dev/sda4 would erase my entire linux > >> installation. Reading the man page helped, but I would like one more > >> piece of assurance. Am I correct in believing/hoping that when the man > >> page says > >> > >> When used without options -a or -o, it lists all visible filesystems > >> and the offsets of their basic signatures. > >> > >> it means > >> > >> When used without options -a or -o, it lists all visible filesystems > >> and the offsets of their basic signatures *and erases nothing*. > >> > >> I really don't want to damage any "signature" on the extended partition > >> that is needed to access the "sub-partitions" it contains. As I said > >> my newly installed gentoo resides on those sub-partitions. > >> > >> thanks. > >> allan > > > > yes, wipefs doesn't actually write anything if ran without options. I > > use it when I suspect blkid doesn't show me all the signatures. > > > > but my message was a shot in the dark because I didn't actually see the > > exact error message you are getting. please send the output of wipefs > > /dev/sda4 and the error message you are getting together with the actual > > commands you are running to get the output. that way there will be more > > helpful replies (and hopefully less flame). > > Thank you. > > Unfortunately, I must start over. After successfully installing linux, > I proceeded to install windows. The result was an unbootable system > "invalid partition table" (thank you windows installer). I rebooted the > linux installation disk and re-executed the grub2-install. I also > entered fdisk and wrote out the result. Still unbootable. Now I > remember why I always install windows (which is basically pushing a > button) before installing linux. Next time I will run wipefs. > > allan > > PS I checked and the gentoo installation guide says that gpt without > uefi prevents dual booting windows.
I'm afraid you're right: "Can Windows 7, Windows Vista, and Windows Server 2008 read, write, and boot from GPT disks? Yes, all versions can use GPT partitioned disks for data. Booting is only supported for 64-bit editions on UEFI-based systems." https://msdn.microsoft.com/en-us/library/windows/hardware/dn640535(v=vs.85).aspx#gpt_faq_xp64_boot Unless you have a good reason for dual booting, why don't you install MSWindows in a VM? -- Regards, Mick
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