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#REMOVE TRUECRYPT BOOTLOADER FULL#In GUID layout the protected MBR component is for want of a better term a compatibility shim within the GPT layout data designed to make the drive appear full to old partitioning tools preventing accidental erasing of partitions due to it being identified as empty,Īgain this was what I was trying to explain to you So a legacy BIOS doesn't use any boot partition information. The first stage in the 446 bytes uses cylinder/head/sector addresses to point to a bootloader's second stage. Legacy BIOS firmware doesn't understand any partition scheme either MBR or GPT. With Grub2 the second stage core.img is placed in a biosboot partition as there is no "MBR gap" between the MBR in an MBR formatted disk and the first partition.ĭoesn't contain any boot partition information the system uses However your understanding is incorrect as in a BIOS/GPT boot the first 446 bytes of this protective MBR is used to point to the second stage of a bootloader with C/H/S instructions just as it would with a BIOS/MBR boot. I don't need you to explain this to me as I was giving links to pages to try to explain this to you. My current grub.cfg is attached as if you want to review it. I think I could have used any older 20-26 Fedora distribution. Problem persisted until I added to /dev/sdd a Fedora 27 place holder. I want to protect the other used partitions on the same /dev/sdd.įor each installed partition, I ran grub2-install /dev/sdx (x is one of and c,e), followed by I do not want to zero the disk and rebuild the GPT. #REMOVE TRUECRYPT BOOTLOADER INSTALL#My question was really asking what do I have to do after I remove a Fedora install that is situated between two other disks having Fedora on them? As noted, I like to make a clear partition by deleting the BiosBoot, /, /home and swap. Restoring /dev/sdd with a placeholder Fedora 27, repaired grub for the SSD on /dev/sde. When I deleted that sandwiched linux, the grub for /dev/sde Fedora only showed the sde Fedora itself, instead of showing itself and the other Linux setups, one on each of the remaining drives. ![]() I normally boot from the /dev/sde, the most recent SSD disk that I added 18 months ago. When I cleaned out, /dev/sdc (a disk that had a Fedora linux sandwiched between /dev/sdb and /dev/sdd, I ran into a problem. dev/sdf had 5 linux distributions, all Fedora (test partitions as std-ext4, btrfs, std-xfs, lvm file systems, with Gnome, xfce and KDE mixes) and what happened when I removed one of one sandwiched Fedora installation. I was trying to address my multi-disk environment. if he uses EFI mode, /biosboot isn't necessary as I stated. #REMOVE TRUECRYPT BOOTLOADER UPGRADE#it doesn't serve any other purpose, is not a separate entity in it's own right and certainly does not contain any details about the location of any partition or their file system type which is the information leslie is concerned about losing.įact is, leslie is about to upgrade his system completely. IN GUID layout the protected MBR component is for want of a better term a compatibility shim within the GPT layout data designed to make the drive appear full to old partitioning tools preventing accidental erasing of partitions due to it being identified as empty, is only there to instruct legacy BIOS machines the drive is GPT layout. You have two partition table choices, ms-dos (MBR) or GPT. the protective MBR is not an actual partition table or layout in it's own right as referred to in GParted when setting up a drive. the protective MBR doesn't contain any boot partition information the system uses. I'm well aware of the configuration leslie uses at present and I'm not making any shocking mistakes here. The OP is using GPT formatted disks with biosboot partitions to store the grub2 second stage and performing BIOS/GPT booting. You are apparently confusing the existence of an MBR (which both MBR and GPT disks have to a different degree) with actual MBR disk formatting. After the protective 512 B MBR is the actual GPT partition table. It is part of the GUID Partition Table standard. I use GPT partitioning and BIOS/GPT booting.Įvery GPT formatted disk has a protective MBR. In BIOS/GPT booting the first 446 bytes of this protective MBR can be used to point to the second stage of a bootloader such as the grub2 core.img contained in a 1 MiB biosboot partition. All GPT formatted drives have a protective MBR which marks the entire disk as used to pre-GPT formatting tools to prevent accidental erasure. This is quite wrong and somewhat shocking. you can have one or the other on a drive, not both. please don't confuse a GUID partition table (GPT) with a master boot record (MBR). that is GPT specific for systems with using BIOS instead of EFI firmware. ![]()
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