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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Changed MBR and now Boot device not found?

In the process of installing windows 11 on my HP laptop, I was asked to change MBR to GPT on my laptop. I put in mbr2gpt/convert in the command prompt and since then every time I start my laptop it ...
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UEFI does not list old MBR installed windows 10 in boot options

this is the situation: I had an old PC running on bios and only MBR, I had bought a SSD for it and migrated the updated windows 10 to it and it was working fine. So I decided to build a new PC but to ...
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Possible to boot OS originally installed MBR after converting disk to GPT?

I have Windows 10 and 7 on my hard disk. I installed Windows 10 on a partition on the disk, GPT, converted the disk to MBR, installed Windows 7 on another partition, then converted the disk back to ...
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Fix MBR for a 16-bit intel 80386sx cpu [duplicate]

i have an old classic computer running ms-dos 3.30 on computer architecture running a 16-bit cpu (80386sx, not to mistake with 80386DX which is 32-bit), i was playing around and messed up the MBR. I ...
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mbr2gpt Failed to retrieve geometry for disk -1 error

I wanted to convert MBR disk to GPT in order to install Windows 11 on one of the partitions. When using mbr2gpt /convert command in PowerShell as administrator following message appears: MBR2GPT: ...
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Reconstruct MBR partition table using known sector offsets

I have an external harddisk whose MBR partition table got corrupted (2 partitions lost [1], and the remaining partition appeared with different capacities under different tools so I deleted [2] it ...
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Hirens Interesting Issue

I am a huge fan of Hiren's Boot PE, I cannot recommend it enough to technicians if they have not already tried it. I have been using it since it came out in 2018. Unfortunately, I was using it last ...
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Data Recovery gave me more data than I had

I have a drive with a MBR partition table, and a 2TB NTFS partition. I performed data recovery on the 2TB partition using Wondershare Recoverit, and when the program finishes, you can recover your ...
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VirtualBox does not boot hybrid GPT/MBR, neither EFI nor MBR

The same version of VirtualBox on the same installed Debian system does not boot from the raw disk USB flash drive, while on the other system it does, it is also possible to boot the USB flash drive ...
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"Advanced Options" Fails to return "Command Prompt"

Pursuant to converting Windows 10 from BIOS to UEFI. The procedure calls for invoking the Command Prompt under "Advanced options", so as to invoke from the command line" mbr2gpt /...
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Recovering data from harddrive with defective MBR

a friend of mine currently has a problem with his external Harddrive. Unfortunately it's the only drive he's got a lot of old family photos on, so it's quite important for him. Behavior and my steps ...
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The ACTIVE command can only be used on fixed MBR disks

I installed Ubuntu as a Dual boot, the webcam did not work so I tested several solutions that I found on the web, when they failed and I made a restart to the OS, I got a message /dev/sdb7: recovering ...
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Windows 10 Install GPT Error

Trying to install Windows 10 then Linux Ubuntu on an Intel MacBook. Disk partitioned as GPT with GParted Linux, but getting the "Windows cannot be installed to this disk. The selected disk has an ...
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Why am I getting an “Unexpected partition style, expected 0 but found 1” when running mbr2gpt?

I have clear Windows 10 Legacy installation but I want to update to UEFI. I tried to apply mbr2gpt /validate, however it fails and i can see in the log the following error: Unexpected partition style, ...
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Bootcamp reboot into Mac OS X & reboot into Windows toggles do not work

I have a Mac Pro 5,1 and for some reason I am unable to reboot into Windows 10 when I have it selected in the System Preferences pane as the startup disk. When I do that I get a flashing cursor or I ...
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Source of active mark in Windows 7 System Reserve partition

My flash drive is MBR partitioned( has active mark)with FAT 32 file system.When I install Windows 10 in UEFI mode via a Rufus bootable Usb flash drive with GPT partition & FAT 32 file system,the ...
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How do I use gdisk/gpt to remove and add entries?

I have what appears to be a corrupted APFS container on my disk and after finding this post it seems that removing and adding gpt entries should help. I just don't know what numbers to use as I can't ...
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How can I solve this MBR2GPT (Cannot find OS Partition) Issue?

According to How can I migrate a Windows 10 from BIOS/MBR boot to UEFI/GPT without reinstalling? I can convert my system disk to GPT without reinstalling and losing data using the MBR2GPT tool, ...
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Why am I unable to boot from Linux Mint after adding its boot sector manually to the MBR via BCDEdit?

I'm trying to dual boot Windows and Linux Mint without modifying the Windows' MBR (contrary to the default setup of a Linux installation). For that, I've installed both the Linux OS and its bootloader ...
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MBR2GPT validation failing

Same issue as:MBR2GPT: Disk layout validation failed for disk 0 I've tried all of the solutions here. This is my diskpart and MBR2GPT log. This is my Disk management window. As you can see, I have ...
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External drive (GPT) crashes file explorer in Windows 10

I was trying to to save data on my external drive which I used a few weeks ago normally (1Tb, NTFS, GPT) but it keeps crashing my file explorer and I am not able to fix it any other way than ...
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Can Rufus damage a device? No media + is not accessible A device which does not exist was specified

I used Rufus 3.15p to create an MBR bootable Windows 7 installer. An error occurred while the Rufus was copying the ISO file. Now the flash USB (SanDisk 8GB) does not work! In CMD Disk part shows &...
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Getting "Bad Disk" and unbootable/readable disk after "Convert MBR Disk to GPT Disk" (Minitool PW)

I was having my MBR disk with my main OS (Windows 10) and many important files on it. My disk is Samsung SSD 860 EVO 500GB Sata with good health. I have run Convert MBR Disk to GPT Disk on it and ...
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How to 'move' grub or MBR to another partition on dual boot

First of all, I am quite new on this so I may say things that are very wrong, so I apologize in advance. The problem that I have is that I have Windows and Ubuntu on dual boot, having Windows in an ...
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MBR2GPT /validate failed [duplicate]

I have an SSD that is currently MBR. I want to convert it to GPT to use UEFI mode instead of BIOS, so I can use windows 11. I did MBR2BPT /validate /disk:0 in windows recovery mode cmd, and it failed. ...
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Ubuntu cannot boot - no valid partition table

I am unable to boot. I have only Ubuntu installed on a computer, and it was working fine. But suddenly I am unable to boot. It says "no valid partition table". I have attached the output I ...
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Convert from MBR to GPT WITHOUT DATA LOSS and NO WINDOWS

So I was trying to install Windows 10 from a bootable USB and unfortunately without reading the error I have deleted the C partition and I got that error Windows cannot be installed on this disk the ...
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PC with 2 disks , each one with a MBR, it is possible to set one as "main"?

2 ssd in my new laptop new one came along with it old one is from my old pc each one has a win10 installation on it, i can't boot from the new ssd anymore after connecting the old one. is there a ...
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GPT formatted drive in Legacy Boot MBR system not readable

My Windows 8 system only contains MBR partitions. I added a big disk internally and formatted it with GPT (given the MBR Constraints of 2TB) and copied some videos. When I plugged this disk in a ...
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diskpart shows one partition as two different ones

I want to convert my hard disk from MBR to GPT via mbr2gpt, but for it to work, I can have a maximum of three primary partitions and diskpart is labeling the same partition as two separate partitions [...
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Making NTFS (raw) image bootable again

I do have an old Windows XP embedded CF drive from a workstation which was encrypted via TrueCrypt full disk encryption. It seems like the TrueCrypt bootloader don't work properly, but I was able to ...
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Got "No bootable device" after converting disk using mbr2gpt and switching to UEFI

I have a windows 10 laptop, and I wanted to convert my MBR hard disk to GPT so I can switch from Legacy BIOS to UEFI (I made sure that my laptop supports UEFI). I ran mbr2gpt.exe and the conversion ...
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what does it mean "dynamic disks support MBR and GPT"?

I'm confused "Do Dynamic disks have GPT and MBR or not?" while in this page, number 3 in table it says there is no partition in Dynamic disks against basic disks that have GPT and MBR ...
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How to clone system from multiple computer to one hard disk?

I have 3 computers. I want to back up all of them. They are all in Windows 10 with SSD. I want to backup all the systems into one single hard disk and choose which system I want to boot when powered ...
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Deleting system-reserved Partition on second drive in order to convert from MBR to GPT

I want to dual boot Windows and Arch Linux on my machine. So I bought a new SSD, which should only contain the linux installation. However in order to achieve this, I have to convert from Legacy Bios ...
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MBR to GPT conversion keeps failing (Windows 10, new M2 SSD) [duplicate]

I’m trying to find a way to reliably convert Windows 10 installations from MBR (BIOS) to GPT (UEFI), but keep running into specific problems. I recently installed a Samsung 980 M2 SSD on an older Asus ...
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EEPC has been corrupted

Just booted my computer and got this message at boot time: "EEPC has been corrupted" Could not boot back into windows. When i booted an ubuntu livecd i saw that all the files were ok. ...
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Can I convert a boot disk from BIOS to EFI (UEFI)?

I have a BIOS MBR (Linux) on my NVME - it works fine. I'm now trying to enable SAM (or Resizable BAR) and in order to do so I have to disable Compatibility Support Module (CSM - i.e. BIOS) from my ...
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MBR/GPT confusion over dual booting Windows 10 Pro and Windows 10 Pro

I would like to install Windows 10 Pro twice on the same machine to have one partition for everyday use and the other for gaming (with the so-called bloatware). According to the this link, I have to ...
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How do I dual boot windows 7 on a laptop with windows 10 OS and GPT partition?

I have Lenovo Ideapad Gaming 3 laptop with preinstalled windows 10. The hard disk is of GPT format and supports both UEFI and legacy boot. I want to dual boot windows 7 in a seperate drive on the hard ...
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MBR with GPT partition

I want to recover a lost partition with TestDisk but there is this step where I must select the partition type of my disk. TestDisk shows "GPT detected" however on Windows, according the ...
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Ubuntu LVM Partition Became Unallocated after Converting from MBR to GPT

I accidentally deleted (not formatted) my Ununtu LVM partition on Windows today using it's Disk Management software. After a long night, I've managed to boot into Ubuntu again with my data intact. ...
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Can I delete old System Reserved partition after changing mbr to gpt (legacy to Uefi)?

I used a third party software to change form mbr to gpt and it created an new system partition ( I think). It says (EFI System Partition) and the old one is still there labeled System Reserved and it ...
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MBR2GPT Not Working - Can Not Find OS Partition(s) for Disk 3

I'm trying to convert my system to UEFI to get ready for the Windows 11 release. When trying to use the 'mbr2gpt /validate' command in cmd its telling me "Can Not Find OS Partition(s) for Disk 3&...
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Making PC Windows 11 ready. Secure boot disabled message

I am making my personal pc Windows 11 ready because I need to get to know it for my work. So I tried the PC Healthy Check from MS, to check if my PC is Windows 11 ready. I get the massage 'PC must ...
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how to clone a storage MBR drive to a GPT drive without affecting the rest?

current situation: i want to clone my D:\2TB HDD to a 10TB one and my E:\1 TB SSD to a 4 TB one. both are for storage, got a truck load of stuff installed and configured as MBR but they need to be GPT ...
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HDD not initialized on Windows 10

To continue on the saga that this question originated, I'm having the final problem. The computer recognizes the disk, but it does not work still. Bellow, I'll put a picture of how it's been showing ...
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Converting Windows 7 mbr boot disk to GPT boot disk

I want to use my old laptop Win7 Pro that was installed with MBR partitioning. I wnat to use this on my new laptop that only support UEFI boot. I have tried various solutions I've found but they all ...
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Windows Disk Management: disk partition is disabled

There is an HDD (WD10EZRX SATA 1 TB). Partition style: MBR. It is divided into three partitions. Two small and one large main partition. For some reason, this main partition is not available. It is ...
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How to back up Master Boot Record from Windows 10 without installing vendor products?

Is there a way to back up the master Boot Record (MBR) files(s) from Windows 10 of the disk where the same Windows 10 is installed without having to install any additional 3rd party tools?
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