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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PC asks to format Truecrypt Volume

I have a truecrypt encrypted non-system partition on an external hard drive. The hard drive is GPT-based. On my previous MBR-based hard drives, I used Diskpart and the command SET ID=64 to prevent ...
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MBR and GPT confusion: installing Debian on macbook air

I'm following this question and trying to install Debian on my MacBook. I've lost that account so I couldn't accept that guy's answer (I'm sorry, I'll not loose this one). So, I followed with his ...
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How to restore MBR and boot windows 7 from GRUB rescue?

I have a dualboot system with ubuntu and windows 7, I wanted to remove ubuntu so I removed the linux partition from disk management from windows, after reboot I'm stuck in GRUB rescue. How to boot ...
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15 views

Clonezilla stopped. Can “sgdisk -z /dev/sdx” destroy all the data on sda?

I need suggestions. I wanted to backup sda2 on which Win7 is installed. I deleted the Recovery Resion. (Probably Testdisk can restore this partition because I haven't done any manipulation on that ...
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22 views

windows 8.1 won't boot after allocating free space from C drive

using amoei partiton manager I allocated free space from C drive in order to setup ubuntu 14.04 in dual boot. It took half an hour to allocate free space however, when my PC restarted back it refused ...
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26 views

4T RAID 0 Partitioning issue

I am building a new workstation 1.2T 10K SAS X 4 for Win 7 Pro SP1 x64 I must use RAID 0 for this workstation. What I would like to have is C = 500G D = rest of spaces So BOIS based system with ...
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23 views

Ubuntu messed up Windows Bootloader (MBR)

I recently tried installing Ubuntu and dualbooting it. I selected the "install alongside Windows 7" option and created a ~60GB partition, and it followed through well. When I wanted to return to ...
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33 views

MBR error at boot Windows 7

I tried to fix it with the DVD but without a result. If the boot order is 1 DVD, 2 HDD it asks to boot from Dvd.
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2answers
69 views

Booting a BIOS bootloader from UEFI mode

I have a Linux setup that I boot in UEFI mode with GRUB. I want to try out OpenBSD, which unfortunately doesn't support GPT or UEFI yet, so I partitioned a drive with a traditional MBR table and ...
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23 views

Bios doesn't see MBR Hard Disk

I was trying to install steamos as a dual boot but it used to fail because it didn't see windows' free spaces. Someone said convert HDD from GPT to MBR. I did it with gdisk and now my Windows doesn't ...
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44 views

How to resize system reserved partition? Win 7 fails to boot afterward.

Firstly, quick background. I have Win7 x64 Pro. The reason I wanted to resize my system reserved partition is this: http://www.pagestart.com/win7br0x8100003301.html The Backup & Restore stopped ...
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33 views

Convert MBR based install to GPT based

I recently re-installed Windows 8.1 on my notebook, in MBR mode, since I was not able to make the UEFI recognize the flash drive as EFI bootable (then I did not make any research in this topic, but ...
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2answers
137 views

Cannot boot to Windows after installing Elementary OS

Last week, I installed Elementary OS on one of my 3 partition so that I can dual boot it with Windows 8. After a couple days playing with eOS, I went back to Windows 8. The problem is that Windows 8 ...
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2answers
90 views

Can't fix MBR after trying everything

OS: windows 8.1, Kali Linux CPU : AMD A4 quad core Brand/mode: Toshiba satellite 4 GB of ram UEFI is disabled What happened: So here is how it started. I installed Kali Linux on my computer but I ...
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1answer
540 views

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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14 views

Is it safe to convert this partition table from GPT to MBR? [duplicate]

I think I need to convert my partition table from GPT to MBR in order to fix a problem with the bootloader. Here is the output of gdisk -l /dev/sdb GPT fdisk (gdisk) version 0.8.8 Partition table ...
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131 views

Windows 7,8 dual boot- winload.exe error: “could not verify digital signature error”

I've a Asus G73Sw that has Windows7 Home pre-installed. I recently added a new 120GB SSD and installed windows 8.1 on it. Everything was fine till recently when the original Win7 on my other HDD, got ...
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22 views

Cannot restore Windows MBR

I was trying to dual-boot with Windows 7 and LMDE. I've done it before without issue, but it seems that this time around neither then MBR nor GRUB will work. I've deleted the Linux partition so that ...
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28 views

Evga X58 SLI - deleted mbr now can't boot

Somehow, and I did not know this until reboot, my windows 7 pro system files were not on the same disk as the mbr disk the bios was booting from. I ignorantly cleared off this "spare" drive and ...
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14 views

how to install windows 7 on GPT disk partition [duplicate]

I try to install windows 7 on my laptop. The partition I try to install it on is in NTFS format. When I clicking thorugh the installation steps and come to the part were I'm going to choose where ...
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23 views

Unallocated space split

Can someone explain this one. Forgive my amateur knowledge... I am using a 500GB MBR disk for my OS drive. Before this, I had a total of 5 partitions with 2 linked together as "extended ...
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1answer
98 views

Can't install grub on MBR, encountered an error “Unable to install GRUB in /dev/sda”

I want to install a linux distribution on my computer. I have a SSD and an HDD. The SSD has Windows 8.1 and I partitioned 200 gigs from my 1 TB HDD to install linux. The linux installation was going ...
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38 views

Unlocking SSD (known password)

I got a Samsung NP900x4D for data backup & a simple Windows re-install. At first boot, after the logo, it just displayed 'Boot error' on a black screen. So I said to myself that the MBR is ...
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232 views

installing 32-bit windows: diskpart convert mbr error

I have an efi-based 64 bit system with win 8 pre-installed. I want to downgrade to 32-bit win 7 and so I booted up a bootable win 7 usb and opened command-prompt with shift+f10. I used convert mbr ...
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76 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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1k views

Windows 10 Tech Preview error: “Windows cannot be installed on MBR disks”. My hard drive is GPT. Why am I getting this error?

I'm trying to install the Windows 10 Technical Preview from a USB drive. The hard drive I'm trying to install on has multiple partitions and is formatted with a GPT partition table. When I start up ...
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2answers
92 views

Rewriting partition table to be BIOS/DOS compatible

tl;dr: skip to Question section Background I have a drive on which Windows 7 was installed. It had a 100MB Windows 7 boot-partition, followed by a partition that took up the rest of the drive. A ...
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39 views

How to change the partition scheme

I want to change the partition scheme in my 500 GB HDD from MBR to GPT scheme without losing DATA on it. What are the traditional tools to do this on both windows 7 and Linux(ubuntu)? And what are the ...
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2answers
145 views

Windows 8.1 cannot be started from grub2

today I decided to use linux again after installing Windows 8.1... I've tried to boot one of the already existing Linux partitions on my computer but I wasn't successful. So I installed PinguyOS (A ...
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237 views

Grub2: “Invalid partition table!”

I have recently had to change bootloaded from my old syslinux to GRUB2. Since I have installed GRUB2 bootloader I am getting the following message on every boot: Invalid partition table! The ...
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3answers
692 views

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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144 views

USB boot error; F11 Key and ASSIST button not working after losing and recovering partition table / MBR

I lost my partition table but I could recover it and I fixed the MBR. I got back all my partition and files include VAIO recovery partition except files on operating system partition ("C:\"). It was ...
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19 views

I've got my MBR on a different drive to my system drive so I need two hard drives to keep my system operational

System: Lenovo E20 Thinkstation 2.93Ghz Xeon / 12GB memory dual 1TB drives. Radeon 5750 GPC Win 7 Ultimate SP1. Ok first off my system is operating fine, but it worries me because it's a bit ...
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26 views

Add partition to dynamic disk with 4 partitions already?

I'm thinking about dual-booting Win 8.1 and Xubuntu, but I have encountered a problem. I have 4 partitions already on my HP Laptop, laid out like so: ...
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3answers
79 views

How to parse MBR data in file into human form? File command does not work

I have MBR data in file and I would like to inspect it. Which Linux command can do this? WHen I ran file mbr.file the output was only mbr: DOS/MBR boot sector
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1answer
96 views

Upgrading internal hard drive to 2 terabyte on Windows 7, do I need GPT/UEFI?

I'm currently trying to upgrade my PC from a 1 TB hard drive to a 2 TB one. I've been through a lot of pain so far, but I hope I'm near the end of it. What I want: All of my data on my 1 TB moved to ...
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137 views

Using Clonezilla (or alternate) to make a *partial* full disk image of a multi-partition, multi-boot hdd

So I have a windows multi-boot system with XP installed first, then windows 7. I also have further partitions for user data, etc. I do not fully understand where (and what) data is stored on a pc ...
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214 views

What's wrong with this GRUB setup?

I have two hard disks. The first one contains both Windows and Ubuntu installations, but the first MBR boots to Windows and the second MBR boots, in theory, to Ubuntu. This worked fine until recently. ...
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2answers
70 views

Is it possible to restore a wiped MBR partition table on a machine that has not been rebooted?

While experimenting with how to fix this, I came across a suggestion to wipe the MBR, so I did. dd if=/dev/zero of=/dev/sdb bsize=512 count=1 Whoops. No partition table. Yes, I have backups, but ...
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64 views

Why does UEFI BIOS only identify a 2TB drive on a 25TB virtual drive?

I configure a RAID6 using 16 2TB disks, and finally get a 25TB virtual drive as shown in LSI MegaRAID BIOS. And then I boot via a USB stick and try to install 64bit Ubuntu 14.04 on it. At the ...
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712 views

Windows ignores GPT disk and converts to MBR during installation

I have followed these steps to install windows 7 home premium x64 on a 3tb drive (asus z87-z motherboard): Windows Setup: Installing using the MBR (Master boot record) or GPT (GUID Partition Table) ...
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61 views

How to restore the Windows MBR

I have a Toshiba Satellite L505D-S5965 with Windows 8.1 Pro and Ubuntu dual-boot, and I can't restore the Windows 8.1 bootloader with EasyBCD. When I use EasyBCD it always says "Missing Operating ...
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1answer
217 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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66 views

difference between installing grub in MBR and partition

The two command descriptions below are copied from a chroot description. I must say that I am confused by the distinction; it leads to several questions: What is the effective difference between the ...
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1answer
110 views

“Operating System Not Found”

I did a bad format of my pc, I think I erased the mbr too. Everytime I turn on pc it shows me the message "No Operative System Found" . I accessed to BIOS and changed booting option to read CD : If ...
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45 views

BIOS can't find hard drive - accidentally changed partition table

My hard drive recently crashed after I had to do hard reboot when my computer froze up. I think there was some I/O happening at the time so there are a couple of bad sectors and stuff. After ...
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1answer
85 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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2answers
128 views

Computer won't boot after uninstalling Ubuntu and reinstalling windows

Hello fellow Internet users, So I decided to install Ubuntu, formatting my hard drive to do so, after a few months I decided to go back to Windows, so I formatted my hard drive and reinstalled ...
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1answer
52 views

Windows installation disk MBR error

I need to install windows on a laptop which has no OS. When selecting the partition of Hard disk to install... Gives me such an error:"Windows cannot be installed to this disk. the selected disk has ...
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34 views

Safe to blank MBR of a disk after adding it to an RAID1 array with mdadm?

I created a RAID1 array of two disks, /dev/sda and /dev/sdb, using mdadm. After several booting problems related to the BIOS and SATA/RAID controller of the board, I accidently created some new ...