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 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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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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352 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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25 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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39 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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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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boot Windows from GRUB rescue

This is my situation: installed Ubuntu without a CD (using unetbootin) dual boot installation (Windows XP+Ubuntu) didn't like the installation and decided to boot into Windows and delete the Linux ...
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1answer
64 views

Moving disk with 4kB sectors from enclosure to internal SATA controller makes MBR invalid

I recently bought a 750GB WD disk for a netbook and formatted it while connected via a USB adapter. Because the adapter would disconnect when it was trying to access the ext4 journal, I connected it ...
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44 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
222 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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What are the differences between MBR vs GPT vs any other partition scheme?

Can anyone tell me what the main differences between i.e. MBR vs GPT or any other partition scheme are? Why would one choose one over the other? I am not an expert but from new release of Mac OS X ...
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49 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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1answer
559 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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3k 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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3answers
1k 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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2answers
136 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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2answers
1k 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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2answers
107 views

How to boot into a Linux, non-primary partition if Windows bootloader is on the MBR

I have Windows 8.1 installed in legacy mode/BIOS mode (ie: Not UEFI at all). Windows 8.1 is installed in the primary partition (ie: first). I (intend to) have linux installed in a second partition on ...
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4answers
3k views

Migrating Windows 7 to new hard drive/partition

So, I'be managed to migrate my Windows 7 data over from /dev/sdb3 to a new partition on /dev/sdc1 using ntfsclone. I managed to resize the volume size to match the new partition size. I also used ...
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46 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
193 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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484 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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250 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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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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27 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
119 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
93 views

First 0x7E00 bytes on USB flash drive have become invisible

I have somehow managed to make the first 0x7E00 bytes (63 sectors) of my USB flash drive invisible to every program in Windows XP. I have tried about 15 different disk editors and tried a lot of MBR ...
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3answers
4k views

Fixing damaged partition table

This is continuation of Recover Extended Partition , but this time I have different problem related partition table it self. I managed to restore partition that I needed and backed up files that were ...
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159 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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3answers
2k views

Use `dd` linux program to save / recover a disk's MBR

I have an Ubuntu OS installed on my laptop. I want to install Windows 7 as well to another disk partition (I will do it by recovering it from a special partition on my laptop). After installing ...
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247 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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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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897 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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72 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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310 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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3answers
978 views

PC can't boot even from a live USB - probably corrupted bootloader or MBR

While getting rid of dual-booted Linux I tried recovering Windows 7's bootloader with EasyBCD. (one-click process described in this video) However, something went wrong and now GRUB is gone as it ...
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79 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
124 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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58 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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2answers
5k views

MBR equals msdos for gparted?

I want to create a MBR partition table with GParted. In the confirmation window I can choose between various types of partition table. Default is msdos. Is it the same as MBR partition table? I'm ...
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3k 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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187 views

Eset antivirus cannot clean the MBR infected virus W32.Sality

I'm using Eset Nod 32 antivirus, Windows 8.1 64 bit, today I meet w32.Sality virus from an USB drive, it look like the virus affected the MBR (Master boot record), all the antivirus I have detected ...
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1answer
134 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
164 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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58 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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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 ...
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1answer
51 views

Windows System partition in a HD different from where BIOS boots

This is a problem I solved some time ago with the bootmgr command without pain and without losing my BCDs, but the way it was working before intrigues me. I have a SSD disk and a normal SATA disk. I ...
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1answer
100 views

How do I boot into UEFI without going through Windows on my laptop?

So I installed Ubuntu on my Windows 8 laptop in a dual-boot configuration for some time, and tonight, I decided I would uninstall Ubuntu. Well, I've managed to lock myself out of Windows and I'm stuck ...
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1answer
6k views

OS Missing? Messed up the MBR on Win7 64-bit

I have a Windows 7 machine with two hard drives: a 1TB C: drive and 500GB J:. I had Windows XP installed on C: and Windows 7 installed on J:. I installed Windows 7 after Windows XP from an installer ...
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692 views

Need help upgrading OSX to Mavericks: Fix GPT and MBR after installing rEFIt

A while ago I installed Ubuntu using rEFIt on a MacBook, 2.4GHz C2D, 4GB DDR3. Sorry, I don't know the exact model. Anyway, I continued to get errors when trying to upgrade to Mavericks. Eventually, ...