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Questions tagged [mbr]

Master Boot Record (MBR) is a type of boot sector popularized by the IBM Personal Computer. It consists of a sequence of 512 bytes located at the first sector of a data storage device such as a hard disk.

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Laptop boot fails after changing boot settings

I'm afraid I heavily messed up a laptop (Dell Latitude E5570, running Windows 7 Professional). Update: I found a way to start Windows … somehow. I'm not sure if running "Startup Repair" from a Win7 ...
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How to convert SSD from MBR to GPT during clean install of Windows 7? [duplicate]

I'm trying to convert an SSD from MBR to GPT when installing Windows 7 so I can use UEFI rather than Legacy boot mode. I realize there are a few related questions here but I didn't find them ...
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51 views

Cannot convert from MBR to GPT

I want to upgrade my disk from MBR to GPT, and I tried using Windows' MBR2GPT.EXE tool to do the job. I used Windows' DISKPART tool to identify the disk I want to convert. However, this happened: C:\...
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Device support UEFI

I now have MBR and I want GPT. My firmware is now Legacy(BIOS) and I want UEFI. My firmware can boot in UEFI (option is there inside). I have Windows 10 PRO. Motherboad: 1949 KBC Version 90.0F ...
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72 views

Dual boot install and re-partitioning to use mbr2gpt tool

I now have Windows 10 Pro, build 17134. I want to create dual boot for Ubuntu 18.04. I want to use MBR2GPT.exe tool because now my BIOS mode is "Legacy" (MBR). Requirement is to have only 3 ...
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61 views

Bootcamp Windows 10 in Legacy BIOS mode reports external pure GPT disks as MBR. Why?

I was under the impression that Windows just required the drive it boots from to be MBR when booting in BIOS mode, hence the hybrid MBR setup created by Bootcamp on my Macbook Air 2012 (this model ...
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70 views

Why does an OS and its installer behave differently depending on whether legacy mode is used or not?

Some context: Earlier today, I attempted to re-install Kali Linux on my machine (dual booted with Windows). To accomplish this, I downloaded the ISO and put it on my Easy2Boot USB stick. In order to ...
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How to convert an MBR SSD to GPT in a UEFI environment

I recently was given an SSD by my friend. he used to use it on his laptop and has passed it on to me. The problem is that it is formatted to work with MBR. I have tried converting it but I would need ...
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78 views

Potential Error with MBR on disk image

I am concerned that the disk image I am looking at has been corrupted or created in error some how. (more specifically the formatting of the disk that the image captured) The highlighted section in ...
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101 views

How to write a protective MBR in Windows?

I have a UEFI machine with CentOS on one disk and Windows 2016 on another. The Windows installer writes the GPT protective MBR, but it doesn't follow the UEFI standard exactly, as described here. It ...
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Converting GPT to MBR for 1 partition without losing data from other partitions

Is it possible to convert a single partition from GPT to MBR without losing data from other partitions? I had installed windwos 10 and Ubuntu as dual boot and i wanted to reinstall windows 10 and ...
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295 views

Dual boot with Grub Ubuntu / Win 10 no longer available with Win10 Ver 1803 update

Dual boot with Grub Ubuntu 16.04 / Win 10 broke when Win 10 automatically updated to Version 1803 in August, 2018. Windows overwrote the Master Boot Record and the Grub menu has disappeared. Ubuntu ...
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hasleo Win Setup From USB tool Destroyed my usb?

I launched the tool normally then selected the win 10 iso file then the tool asked me to select from MBR for bios - GPT for UEFI - MBR for bios and UEFI i have selected MBR for bios and UEFI and ...
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Clear a Linux storage device with sgdisk

I wish to use sgdisk to delete all partition definitions and data from a storage device, then create a GPT and two partitions on it . The best solution I've found is to use the -Z and the -o options. ...
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WD Edition of Acronis True Image makes unbootable drive [duplicate]

https://support.wdc.com/knowledgebase/answer.aspx?ID=10445 indicates the WD edition of Acronis True Image will not be a bootable drive. How might a cloned drive (MBR partition table, not GPT, since ...
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Restore Windows NT 3.51 boot loader without system diskettes

I have an old Windows NT 3.51 machine and recently, Windows cannot boot. I do not have any system diskettes to try to restore the MBR from there and the machine doesn't have any usb ports. I only have ...
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OPNSense VGA MBR USB

I want to install OPNSense on my HP DL360 G6 but it only boots USB drives that use MBR partition scheme, not EFI. The VGA img file is EFI, so it doesn't recognize it and doesn't boot. And when I try ...
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About boot sector(s), MBR etc (Windows)

I had a disk that boots with Win-7. On the same computer I installed another hard disk that boots with Win-10. So now when I launch Windows, I have the choice between Win-7 and Win-10, ok. Now that ...
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137 views

Create MBR Bootable Ubuntu USB from Mac

I need to create an ubuntu 16.04 server install USB from a Mac but the computer I'm installing it to only supports booting from MBR USBs. It seems when I try dd it makes it an EFI formatted drive. ...
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217 views

Is there any way to convert Drive from GPT into MBR without formatting using windows 10 utilities? (No third party software)

I want to allocate more space for my GPT drive, using windows 10. Is there any way to convert my drive which is in GPT format into MBR, so that I can allocate space for partition D? I really don't ...
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from GPT to MBR and vice versa, now I do not see previous partitions

I will go straight to the point, I have a laptop in dual boot (Windows 10 and Kali Linux) which has been converted from the GPT partition to the MBR (for reasons I do not know), I used gdisk to ...
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213 views

Broken boot manager bootmgr Windows 10 SSD bootrec

takes a deep breath My System: Windows 10 Home Version 1703 OS build 15063.966 Trying to update to version 1803 (KB4340917) The updates continually failed. I literally had the windows 10 upgrade ...
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69 views

Recover MBR after overwriting it with an empty one

I've accidentally messed up my Windows XP hard drive. I wanted to copy the MBR from this disk to a new SSD, but I've done the opposite. I do not have a shadow copy of that volume and thought that ...
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How can I create 4096 sectors on an MBR drive to match the configuration of older drives in Linux?

Few years ago I bought 2 drives that came pre-formatted with 4096 byte sector and MBR partition table. Now I bought 3rd drive but as it's more recent revision it came preformatted to GPT. When I'm ...
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181 views

How do I format an HDD to GPT partition style using Windows 10's installation disk

I'm trying to install Windows 10 in GPT mode, but unfortunately the disk inside the computer I'm trying to install into is already formatted using MBR. I've been working around this problem by first ...
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Is there one MBR for all partitions on a HDD?

It seems that there is one MBR per physical Disk Drive. I.e., if your MBR on the drive is corrupt then all of the partitions are affected. And before trying to fix the MBR, I should backup the whole ...
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145 views

How to backup MBR on Windows?

How can I backup my MBR (Master Boot Record) on Windows)? I would prefer a built in tool (from Microsoft, etc.)
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46 views

Two Windows Boot manager entries in Boot Priorities after MBR2GPT.EXE

I have M.2 SSD with Windows 10 installed. I used mbr2gpt.exe tool to convert the drive from the Master Boot Record (MBR) to the GUID Partition Table (GPT). Out of laziness I entered the /allowFullOS ...
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73 views

Reinstalling a MBR to a usb drive?

Yesterday, by accident, I overwrote a bootable USB flash drive using dd. I did manage to recover most of the data on it (using TestDisk), including the partition containing the OS. The partition ...
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418 views

Converting MBR to GPT during Windows installation without wiping the disk

I get an old laptop with Windows 7 installed. Wishing to just clean install Windows 10 while keeping the data on non-system partition, I made a mistake by booting from Windows 10 installer USB drive, ...
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is it possible to convert bitlocker encrypted GPT drive to MBR?

I have found some guides how to do this in diskpart or by using EaseUS partition master, but they don't mention if it would work with Bitlocker. And before you ask me why I want that - to be able to ...
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HDD MBR problems?

So, I installed W10 on an SSD with an HDD also installed. This HDD is WILDLY noisy, so I'm swapping it out for a different, quieter one. Now, I plug the new HDD in, so there are now three drives and ...
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windows xp installer cannot create partition in empty slot

I mainly use Linux, and have 3 partitions (which I do not want to change) on my MBR disk. I have one slot available for Windows XP, for occasional use offline, such as updating my BIOS. How do I ...
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150 views

Unable to boot into bootcamp (Windows 7), due to resizing only OSX partition

I have a MacBookPro 2011, OSx 10.9.2, it is dual booted (using bootcamp). I followed this youtube video that shows how to resize mac https://www.youtube.com/watch?v=zhkdOLXT6Eg but after resizing ...
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390 views

Windows 10 slow boot up after converting to UEFI

I installed Windows 10 on Legacy BIOS a few weeks back but today decided to switch to UEFI by following the steps in this article. (Using MBR2GPT) The conversion went well but now my MSI CX62 laptop ...
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Is it possible to fix MBR without user interaction?

I have a case in which a virus spreaded through an intranet, and rewrote the MBR of 12.000 machines. Now, I know how to manually repair an MBR, but I'm being asked to provide a solution to automate ...
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Read only file system after reformatting and repartitiniong

I am facing some issue in my one of hardisk. I have cleaned it completely, scanned it for bad sectors and reformatted it but again it giving me readonly file system error on next day. Here is ...
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Lost volume on external 4TB drive by converting from GPT to MBR

I am fully aware that i acted like a complete fool. Situation: I have Seagate M3 4TB external drive has one volume sized 4TB and containing 300GB of data. I converted it from GPT to MBR. The result ...
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68 views

Lvm on luks: can unencrypted mbr be used to install malicious software if only a big partition that covers the entire device is encrypted?

In most guides out there, to made a stronger full disk encryption setup, it is proposed to place /boot on a separate usb device. However lvm on luks setup covers the first partition of the main disk (...
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1answer
483 views

Converting GPT to MBR while Windows 10 is Installed

I'm very curious about this one. I have a UEFI Laptop, Lenovo Ideapad 320 to be exact, and the hard drive partition is on GPT format. If I use a third party to change the partition format without ...
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How do i convert my pc from MBR to UEFI [duplicate]

I am running windows 10. I want to duel boot Android-x86 and Ubuntu mate. When installing mate, I was told that i was using MBR. I didnt think much of it until I went to the partition table where my ...
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1k views

Why can't windows boot from fat32 formatted USB on BIOS computer?

I have tried to search for this question and found no answer. So, from what I understand is, the boot process works as following: POST BIOS BIOS calls MBR of selected bootable disk MBR calls Volume ...
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2answers
75 views

Deleted everything from pc

Recently I decided to install Kali linux on my device by replacing windows completely, I made a bootable kali pendrive and started the installation process, since I didn't want Windows, I chose to ...
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Can I re-initialize a disk changing between MBR/GPT without losing data?

A Windows 10 PC started today with a black screen "Preparing automatic repair" on loop. Then somehow Windows started but one HDD was missing. From Disk Management I can see the HDD, but as an ...
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138 views

Why does GNU parted write data to the first 440 bytes of the MBR?

My understanding is that an MBR is 512 bytes. The first 440 bytes (give or take a few bytes, depending on the implementation) contain the boot loader/bootstrap code area. The remaining bytes contain ...
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534 views

What does Grub write to the boot sector for MBR boot?

Part of the syslinux install process involves installing mbr.bin to the master boot record of a device. dd \ conv=notrunc \ bs=440 \ count=1 \ if=/usr/lib/syslinux/mbr/mbr.bin \ of=/dev/sdX ...
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5k views

Windows 10 MBR boot - bootrec /rebuildbcd says “requested system device cannot be found”

During the cleanup after building my PC I managed to break my Windows installation and I can't figure out how to fix it without starting over. I have a Samsung 960 M.2 SSD in an Asus Strix X370-F and ...
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1answer
3k views

How to fix a partition detected as RAW, when Chkdsk correctly reads it as NTFS?

My external HDD suddenly started reporting as "931.51 GB RAW (Primary)" in Windows disk management. I tried using DiskInternals Partition Recovery, which indeed reported the drive being only seen as ...
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314 views

Alpine LVM installation with UEFI/BIOS dual booting support

I want to move from Arch+Windows [GPT, dual boot using built-in EFI menu] to Alpine+Windows [GPT, legacy BIOS booting support, XEN, LVM partitions for both Alpine as Dom0 and virtualized Windows as ...
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How to restore Legacy Grub in a bootable state?

I'm using Grub 0.97 (so-called Legacy Grub) on an drive with an MBR partition table and four partitions, sdb{1..4}. The content of these partitions are copied over from another disk. sdb2 contains /, ...