Trying to run from logical partition - GRUB doesn't detect it

Hi all, I only have a single SSD in my laptop with the following setup (in order on disk):
sda1 - System Reserved
sda2 - Windows 8
sda4 - Extended Partition
sda5 - Arch 2 (this is where I'm trying to move my Arch install to)
sda3 - Arch (this is the one I can actually boot into
(unallocated space)
This is what I want things to look like eventually:
sda1 - System Reserved
sda2 - Windows 8
sda3 - Extended Partition
sda4 - Arch
sda5 - some other distro
sda6 - storage (I want this accessible by all OSes)
Here's how I think I'm going to do this:
- move Arch installation from after the extended partition to before it (since the extended partition is a big chunk of mostly free space, and I would like it to go last.
- after verifying that I can boot the Arch installation from the logical partition, delete the Arch installation on the primary partition and absorb the free space into the extended partition
Here's what I've done:
- used 'dd if=/dev/sda3 of=/dev/sda5 bs=4096 conv=notrunc,noerror' to clone my working Arch installation to the logical partition (sda5).
- ran 'grub-mkconfig -o /boot/grub/grub.cfg' to update GRUB and add the logical partition to the list of things to choose from in the Grub menu.
After running 'grub-mkconfig' nothing new was added to the menu.
Questions:
- Is what I want to do even possible?
- can I have the logical partition marked for storage be accessible to Windows 8?
- Is there an easier way to do what I want to do?
- How do I get GRUB to detect the logical partition?
- Is it possible to boot into a logical partition?

grub doesn't always automatically pick up arch installations. Is os-prober installed? You can always add the entry manually e.g. in 40_custom or whatever. Don't forget to adjust fstab.
Just to be clear: you have an MBR formatted disk and are talking about traditional logical partitions, right? Not lvm?
Last edited by cfr (2013-02-02 01:31:48)

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I'm trying to understand once and for all the process by which Arch can be booted from a system with UEFI firmware and an MBR partition table. Some of the information on the wiki seems conflictual / non-nonsensical at times. Apologies in advance if this has been answered time and time again, but I did search around and all I found was fixes to get Arch to boot rather than comprehensive explanations of the boot process.
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Last edited by padavoine (2012-06-06 09:35:10)

padavoine wrote:
CSM in UEFI firmwares do the exact same job as normal BIOS firmware.
So it's something specific to the Mac that it's able to boot from a partition's VBR while ignoring the MBR?
The reason that warning is given is because grub-legacy modifies more than just the MBR boot code region. It can overwrite some parts of GPT header.
Not true, the instruction is given in the context of an MBR format, not in the context of a GPT format, so there's nothing to overwrite and Stage 1.5 should be safely embeddable in the post-MBR gap.
In BIOS boot (normal case in non-UEFI firmwares or CSM in UEFI firmwares) does not read the partitition table (atleast it is supposed to be dumb in this regard), it simply launches whatever boot code exists in the 1st 440-byte of the MBR region.
So again, you're saying it's specific to the Mac UEFI that it lets you choose a partition whose VBR to load, regardless of what's in the MBR?
I haven't used Macs so I can't comment on Mac firmware behaviour. But normal BIOS firmwares (legacy and CSM) launch only the MBR boot code and not the partition boot code. We need some chainload capable boot manager in the MBR to launch the partition VBR.
grub-legacy does not know anything about GPT. So when you install grub-legacy to /dev/sda, it install the MBR boot code (stage1) and stage 1.5 code to the (supposed) post MBR gap. Since there is no actual post MBR gap in GPT (which has been taken over by the header and partition table), grub-legacy does not check for GPT and it assumes the post MBR gap actually exists which is invalid in case of GPT. grub-legacy embeds the stage 1.5 code in GPT header and table region (which grub assumes to be unused post MBR gap) and thus corrupts it.
0xEF is the MBR type code for UEFISYS partition. grub stage 1 (used in grub-legacy, not in grub2) is the 440-byte boot code stored in MBR for use in BIOS boot.
That's precisely my point: with neither proper executable code in the MBR (since grub was installed to a partition, not to the MBR) nor a UEFI system partition, what does the firmware default to, and how does it know what partition to boot from?
In that case it might fallback to UEFI Shell (if it exists) or give an error similar to the case where BIOS does not find any bootable code in 440-byte MBR region.
So even with bootcamp/CSM, the disk also needs to be MBR partitioned. So Macs use something called "Hybrid GPT/MBR" ( http://rodsbooks.com/gdisk/hybrid.html ) where the MBR table is synced to match the first 3 partitions in the GPT table.
I know what Bootcamp does, and that's not what I was referring to. I was referring to standalone Vista installs. I wasn't puzzled at the fact that they were using MBR, I was puzzled at the fact that contrary to the recommendations for the standalone Arch install on the wiki (with MBR partitioning, not GPT), they didn't do anything to try and prevent Windows from writing to the MBR.
You can't prevent Windows from overwriting the MBR region. You have to re-install the bootloader (grub2/syslinux etc.) after installing Windows. That is the reason why it is recommended to install Windows first and linux later.
Thats not true. I actually find it is much easier to install Windows UEFI-GPT using USB rather than a DVD.
I haven't done it since the only UEFI system I own has no DVD drive, but I was under the impression that it was simply a matter of choosing DVD UEFI boot in the firmware's boot menu.
format the USB as FAT32 and extract the iso to it. That it.
No, thats not it, precisely, it doesn't work out of the box with a standard Windows install USB, you need to fiddle around:
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Most of the Windows isos already have /EFI/BOOT/BOOTX64.EFI file, so no need to extract the bootmgfw.efi file.
There is no difference between in BIOS booting in UEFI firmwares and BIOS booting with legacy firmware.
There has to be a difference, at least in the Mac firmware (sorry, I keep switching), since legacy firmware, AFAIK, cannot chainload a bootloader in a partition's VBR without there being some sort of "stage1" code in the MBR.
No idea about Mac EFI. Apple made a spagetti out of UEFI Spec. To actually understand how Mac firmwares work, read the blog posts by Matthew Garrett of Redhat, about his efforts in getting Fedora to boot in Macs.

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I updated to OS X Mavericks and now trying to run Logic Pro X on a MacBook Pro mid-2009, using an M-Audio Axiom 49 and an M-Audio Fast Track Pro... Logic keeps telling me that Mac OS X MIDI Services are not available... How do I solve this problem?

I just checked to see if the update to OS X Yosemite 10.10.1 solved any of the issues outlined in my previous post, and to my dismay, nothing has changed -- all of the previous problems persist.
My iMac (8) -- it's renamed itself eight times since the recent troubleshoot with the Apple tech rep -- shows up as a shared device in Finder on my MacBook Pro, but when I click on it, I cannot establish a connection using "Connect As". So I've attempted to connect using the menu "Go/Connect to Server...", using both (alternately) the iMac's name and IP address, to no avail. I get a message which reads: "There was a problem connecting to the server 'Peter's iMac (8)'. This server may not exist or it is unavailable at this time. Check the server name or IP address, check your network connection, and then try again."
Here's what I know:
The server -- Peter's iMac (8) does exist;
The server -- Peter's iMac (8) is available at this time;
The server name -- Peter's iMac (8) -- is correct, as specified in the system sharing preferences;
The server IP address is correct, as specified in the system sharing preferences;
The network connection is active when I attempt to connect.
I'm convinced the problems stem directly from the OS X Yosemite update. None of this was ever remotely an issue in the previous OS X's -- any of them. This is maddening! What can be done? Apple?? Anyone???

I have purchased a mac mini only to find I am unable to run Logic pro 9 , is there any way this can be achieved? It has been suggested that I partition the drive and install a copy of an older operating system to run the Logic Pro, is this feasible?

I have purchased a mac mini only to find I am unable to run Logic pro 9 , is there any way this can be achieved? It has been suggested that I partition the drive and install a copy of an older operating system to run the Logic Pro, is this feasible?

BDAqua wrote:
....but some other new Macs will boot frome a clone of 10.6.8...
Only with a whole lot of effort and instability. As the new Minis have
hardware (HD4000, USB 3.0, etc.) that is totally unsupported in old OSes.
The only option would be to see if it would work by installing in a virtual machine
running 10.6.8. I'm sure there will be some performance hit but whether it would
be enough to be unusable is the question.

Trying to run from logical partition - GRUB doesn't detect it

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