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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Why can I boot from a USB device without “making it bootable”?

It seems like you can boot from a USB device without a bootloader to me. Even my 6 years old computers that still have a BIOS. From what I read the BIOS simply looks for an mbr, loads it and ...
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Relationship between MBR / GPT / UEFI and their limitations

I have a situations where i have to decide to use MBR or GTP and UEFI. I've read too many articles on internet, but I'm confused about some things : I've read that MBR does not support drives with ...
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Raw partition after installing window on UEFI GPT

I decided to perform clean installation of window. During the proccess it was disable to install windows on chosen partition because it Was not GPT, so I changed in the bios to support only UEFI (do ...
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Cannot Install Bootcamp on Mac Fusion Drive

I have two drive installed in my mid-2013 Macbook pro. It is running osx maverick. I set the two drives (an ssd and a regular HD) up using the fusion drive (following the diy fusion drive guides out ...
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Recommended setup with 2 hd and 2 os

I have a Thinkpad T420 laptop, with 2 hard drives: SSD drive, 128GB, GPT (disk1) normal HDD, 5400 rpm, 500GB, MBR (disk2) I need to run 2 OS in this laptop: Windows 10 + Ubuntu 16.04. So, I've ...
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2answers
3k views

How to fix Truecrypt MBR using Command Prompt or Linux live USB?

I was playing with TrueCrypt and decided to make a fresh installation of Windows 7 from USB stick. Unfortunately Windows 7 installer: "setup was unable to create a new system partition" My entire ...
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2answers
24 views

Ubuntu - Windows 10 - MBR

I realise this question looks like so many others, but its slightly different and I cannot find an answer elsewhere. Basically I have goosed my MBR numerous times in the past and this time I wanted ...
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1answer
32 views

Can a GPT Hard Drive Read MBR Hard Drive?

So, here is my problem: I installed Windows 8.1 Pro on a UEFI/GPT HDD (hdd0). I've been using my computer for a while and it turns out that it's running out of free space. Is it possible to create a ...
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3k views

Fix MS-DOS MBR Without DOS Boot Disk

How can I restore the MBR for MS-DOS without having an MS-DOS boot disk or floppy drive. Ideally, I would like to be able to do this from a Windows 7 Win PE disk. The only solutions I've found online ...
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23 views

Dual Boot Centos7 and Windows 10 - Grub issue with gpt

I am trying to install centos on another partition besides my Windows 10 install. I have installed centos successfully and it boots into centos. I then tried to add windows 10 to the grub.cfg file. ...
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1answer
49 views

Multiple operating systems on the same PC and Large Drives

I've always had multiple OS on my Computer. Using MBR and Boot managers i was able to do this until now. But today i've replaced my Pc with a new one that have a large HDD , 5TB. Reading on internet i'...
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29 views

Set up dual boot Debian (Mint LMDE) Linux + Windows 8.1 **without** efi

The specifics is that in my case Windows 8.1 is installed not in EFI mode: so the partition table is in msdos/fat format and there is no efi partition. Unfortunately: All how-tos and manuals I've ...
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1answer
47 views

MBR to GPT migration on Windows 7 x64 — what is the path forward

I use Backup Exec System Recovery to migrate to larger hard drives, to new PCs, etc. I have painted myself into a new corner, and am looking for the way out. Situation: I migrated to a new hard ...
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3answers
2k views

Convert GPT disk to MBR disk in-place?

Is there any way to reliably convert a disk from GPT to MBR in-place? (i.e. without having to backup/restore any partitions.)
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2answers
2k views

Is it possible to have one MBR partition and one GPT partition on the same drive?

I would like to use one hard drive on an older computer that doesn't support UEFI, and have it boot from an MBR partition, while having another GPT partition which would be used to boot another ...
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1answer
32 views

diskpart.exe on Windows 7 with GPT disk — unable to set partition active?

On windows 7. I cannot figure out how to set a volume active or boot on a GPT disk with diskpart. Is that the wrong tool? I am having to go back to MBR, because I just can't figure out how to ...
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2answers
1k views

Erase MBR from a Mac

So I found a way to EFI install my Windows 8 to my MacBook Air - and now my partition table looks kinda ugly: /dev/disk0 #: TYPE NAME SIZE IDENTIFIER ...
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1answer
36 views

Get Windows 7 to boot again

History Originally only Windows 7 was installed on a partition. The first partition was a 100MB recovery partition while the Windows OS and data files was on the second partition. Then I installed ...
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1answer
20 views

BIOS with 'no issue UEFICompliant' support for GPT partition tables

I would like to change my hard drive partition table from MBR to GPT, (since MBR supports 4 primary partitions). After some searching, I discovered C:\Windows\Panther\setupacl.log, and found a few ...
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2answers
66 views

How to fix mbr if I can't get to the cmd or terminal, and I deleted grub?

Problem I removed the GRUB, BUT in Windows disk management, I started to delete the first (of four) Linux partitions and after I got tired of waiting, I restarted the PC during the deletion process....
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1answer
59 views

Why does GParted make my flash disk bootable? If not malware then what?

I did sudo dd if=/dev/zero of=/dev/sda where /dev/sda is my flash disk. /dev/sda was all zeros after this. Then I created a partition table with GParted on the flash disk. I made no other changes. Now ...
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82 views

Way to get back formatted Windows MBR partition in dual boot system

I have a Dual boot system and accidentally formatted Windows MBR partition while trying to format a USB (via disks utility). Now I am not able to boot into Windows. My grub doesn't show Windows ...
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Install Windows 10 on an EFI / hybrid MBR Macbook?

I have an 2011 macbook which has been updated to EFI 1.7. Bootcamp sets up a hybrid MBR to support Windows 7. I need to install Windows 10 on this hybrid MBR setup instead of an EFI/GPT setup ...
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Clonezilla fails at cloning with mismatched GPT and MBR partition

I got this message: This disk contains mismatched GPT and MBR partition: /dev/sda Clonezilla's FAQ says: You might have installed an OS with GPT partition table, and later overwrite the ...
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1answer
20 views

Does the 2 terabyte limit for MBR apply to a partition or the entire disk?

This is really unclear from what I read. I have a 3TB secondary hard drive, but I want to install Windows 7 on that (for dual boot). I have an old BIOS so UEFI is not an option. I understand MBR only ...
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2answers
6k views

Convert MBR to GPT - Without any OS

I just got a new laptop without any OS (it had FreeDOS, but not anymore). When I go to Windows Installer and try to create a new partition from un-allocated space, I don't get any Error message but ...
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How to correct 512-byte sector MBR on a 4096-byte sector disk?

Final update: I already knew what I needed to do to fix this problem; I just didn't know how to do it. I was hoping there would be some ready-made tool to do that automatically - but couldn't find ...
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7answers
15k views

Recovering damaged external hard disk by installing internally

I had a 1TB Western Digital (My book series) 3.5" USB3. One day, the SATA to USB3 converter board was damaged and has not worked since. I decided to open the cover and use the HDD as an internal HDD....
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3answers
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How can a MBR formatted hard drive exceed 1.81 TiB capacity?

I recently purchased an external disk drive with 3 terabytes (2.72 TiB) of storage capacity. Now according to Wikipedia's article on MBR, the maximum addressable storage space on a disk formatted ...
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2answers
65 views

Booting with MBR in UEFI (No CSM mode at all)?

I'm asking here since I can't find a clear and definite answer to if it is possible to boot with an MBR partitioned hard drive in an UEFI-only environment. I've read this question but it is still ...
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Did I lose my data by converting HDD from GPT to MBR? [duplicate]

I tried to install Windows, which required an MBR disk instead of a GPT. I converted GPT to MBR using diskpart utility. After that all my logical disks disappeared and only one (with total amount of ...
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28 views

UEFI boot and data disk

I'm on Windows 10 and I'm ready to convert to UEFI boot, but I want to know, if I need to have all my disks with GPT or only disk from which I will boot. Because my data disk is really full and ...
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106 views

Getting error: Windows cannot be installed to this disk. The selected disk is of the GPT partition style

I am trying to reinstall Windows 10 on my friends machine from bootable USB. Following is what I have done till now: I created bootable USB using Windows 10 ISO and Rufus with GPT Partition scheme ...
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1answer
74 views

Do I have to have my OS installed with UEFI to convert my system HDD from MBR to GPT without data loss?

So as of right now I have a PC with a BIOS-only mainboard (Gigabyte 775 - GA-P35-DS3) with which I installed Windows 10 64bit on my 4TB hard drive with MBR. Now I'd like to buy a new mainboard with ...
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1answer
35 views

First 32KB of logical partitions. What is there? Consequences of allowing/limiting access to it

This is a very low level disk question, and I have only been working with this stuff for a short time, and it is quite a different learning experience, so pardon any carelessness with terms, ...
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Windows 8 install on MBR

I have a Notebook that dual-boots Arch Linux and Windows 8 via GRUB. After swapping hard drives, Windows couldn't boot anymore, and I've spent hours on fixing this to no avail. (I've cloned everything ...
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Windows 8 won't boot, BCD error

My Windows 8 laptop has a boot problem. When Windows tries to boot, I get this error message: Boot configuration data is missing File: \BCD Error code: 0xc0000034 So as suggested I booted to ...
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1answer
916 views

Disk boot failure in Windows 7 64-bit after installing the latest NVIDIA drivers

I successfully installed the newest NVIDIA drivers (275.33) in Windows 7 64-bit and rebooted afterwards just in case. After the reboot, I got an error about missing MBR. I disconnected the slave disk ...
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3k views

How to repair a Windows7 boot sector on a secondary hard disk?

I am trying to rescue a damaged Windows7 here. Unfortunately, its boot record is corrupt (but its partition table is okay, only its boot code is bad). I've put its hard disk into a working Windows ...
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1answer
39 views

How would I know if a hard drive was jeopardized by a power surge?

I have a hard drive, from which I have rebuilt the MBR and Boot Sector. I was able to recover the data. My client's computer and data were easily visible prior to a power surge in the home. She would ...
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2answers
378 views

replace efi firmware with old legacy bios?

So I bought a new laptop with 64-bit windows 8 pre-installed, and in preparation for downgrading to win7 32-bit, i've been reading about EFI and MBR etc.. It seems like the firmware which boots disks ...
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35 views

HDD Stopped Responding

I have an external 500GB hard drive containing a WD Scorpio Black, used all as one partition, encrypted with BitLocker and runs very well. This morning I connected it to my PC, it asked for BitLocker ...
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42 views

Potential problems with Seagate DiskWizard when extending beyond 2TB with MBR

A bit of an oldy, but couldn't find an answer to my exact question. My motherboard doesn't support UEFI but I want to boot from my 4TB Hard Drive and use it all. I heard Seagate DiskWizard allows ...
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3answers
95 views

Messed up my MBR, can't boot from hard drive

can you help me please? I messed up my boot partition and I don't really know how. I tried to install grub wherever I could and accidentally formatted MBR. Bootrec.exe /FixBoot doesn't work Ubuntu ...
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1answer
3k views

Linux set bootflag?

Ok, so I messed up my MBR and I need to set the boot flag, (not the active partition!). I have searched for similar questions but all the answers I see is "how to set a partition to active", and that ...
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1answer
897 views

Can external HDD be larger than 2TB with MBR?

I want to expand my media player’s storage with a 4 TB external HDD. The media player does not support GPT, however, just MBR. I read that MBR only allows a maximum partition size of 2 TB. Are ...
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1answer
87 views

I created a Windows To Go hard drive and it requires legacy boot

I used AOMEI Partition Assistant Standard Edition 6.0 to create a Windows To Go hard drive (MBR, 4 partitions, Toshiba USB 3.0 v73600-H 2TB) Click for screenshot. I am able to boot to my hard ...
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3answers
12k views

How to tell which physical disks have bootable MBR?

The computer I am using right now has 6 physical disks attached. Using the BIOS's "select boot device" functionality I have discovered that I can boot off 3 of these disks into the exact same ...
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2answers
175k views

How to fix Windows 10 boot loader from Windows

I installed Ubuntu on system that has Windows 10 installed. I can boot to Windows or Ubuntu normally using GRUB. I want to delete Ubuntu partition but first I must restore Windows 10 MBR. Here https:/...
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1answer
473 views

How can I duplicate HBCD's XP boot loader with my MBR?

I'm stumped. I'm migrating a Win XP Lenovo T500 to an SSD: I copied the XP partition using EaseUS to the SSD. Aligned the boot sector using Gparted The MBR needs to be rebuilt (fair enough) ...