A disk read error occurred press ctrl + alt + del to restart
or in translation There was an error reading the disk press ctrl + alt + del to reboot ! It is quite possible friends, you are now sitting in front of the monitor, watching this joyful message in the upper left part of the monitor and thinking that it can indicate, also look through the options in your mind, but do not know which one to apply first:
- Check for partition errors with the operating system (C :) Chkdsk utility (after all, there was some kind of reading error), but how to boot into Windows?
- Connect the hard drive to another SATA connector on the motherboard or replace the SATA data cable.
- Automatic recovery - but it doesn’t even get to it, since this error instantly appears on boot. Disk read error occurred press ctrl + alt + del to restart on a black screen.
- System recovery using a restore point , but again, how to do it, if the operating system does not boot, and will it help?
- Download to recovery environment and recovery of the operating system loader Bootrec.exe / FixMbr and Bootrec.exe / FixBoot commands, as we did with loading errors BOOTMGR is missing press CTR-Alt-Del for restart and mistakes NTLDR is missing ?
I will not torment you and I want to say that the causes of this error may be different, first of all, the damaged master boot record of the hard disk (MBR) is to blame! On new hard drives with a GUID partition table (GPT), I also came across such a disaster.
A damaged Windows boot loader may also be to blame, and in that case, the logic BOOTMGR is missing press CTR-Alt-Del for restart or NTLDR is missing, but an error can occur, but A can also go out. .
In order not to be unfounded, I will tell you everything and show you. Let's start with simple solutions and finish with complex ones. They can all help.
Note: The article is suitable for Windows XP, 7, 8, 8.1, only if you have XP, choose the latest version in this article or this one update .
Friends, if everything that is written below will shock you and you are ready to say goodbye to your operating system and programs installed not in one day, then it is in vain! There is a way much easier than all these dances with a tambourine around the command line, this method is given last, it will suit all operating systems, get to it!
I often get computers to work with this error and like any person periodically confronted with one and the same task, I developed a kind of behavior algorithm.
First of all I ask the person what he was doing at the computer before the appearance of an error and enter the information in a special text file. Then, if I don’t remember the decision from memory, I’m looking at the information in the same file if there was such a problem before and how I solved it. Over time, this file has grown and even my colleagues began to look at it, and one of them once said: "You would have put all this on the Internet, it would be useful for many people, why the info would be asshole!"
Placing a simple text file into the network was somehow embarrassing, and that’s how our website appeared!
So friends, my memory and the history of this file said that basically error A disk read error occurred appeared in users after such actions:
- Recently, before booting the operating system, the hard disk check for errors was run frequently and during the next such check I simply disconnected the computer from the network and turned it on again, I thought that Windows would start without this long check, as a result, the error A disk appeared on the black screen read error occurred press ctrl + alt + del to restart . How can I get a working Windows back, there are a lot of programs I need?
- Checked the operating system for viruses scanner Kaspersky Virus Removal Tool and a warning was issued that the boot sector of the hard disk was infected, after cleaning the system from viruses, the computer began to boot with the same error.
- I dropped a working laptop on the floor and the error, which we already knew, came out.
- Checked the hard drive on the bad blocks program HDDScan and accidentally launched a hard disk check with the Erase test — Test in linear recording mode (sector-wiped data). I came to my senses literally in a couple of seconds and stopped the test, but the next time the computer booted with error A disk read error occurred. I booted from the LiveCD all the operating system files are whole, but for some reason Windows does not boot. On the Internet they say that I managed to erase the boot record of the hard disk (MBR). How can I restore it?
- I installed a second operating system on my computer, after installation only the second one naturally loaded; I installed it as a boot manager. EasyBCD 2.0.2 loader , but apparently something was wrong there and not a single Windows is loading, I am sitting here with an error when loading A disk read ... and something else there. What to do?
- With separating the space from the D: drive and attaching it to the C drive: The computer rebooted and the error we got was familiar.
Friends, any computer programmer will tell you that in all the cases listed, for the most part, the boot record of the hard disk (MBR) suffered from user actions, and only in the fifth case did the user suffer from Windows 8 boot files. I listed the causes for the error, we go further.
It is important to know: Any operating system boots in the same way - the BIOS reads the first sector from the specified priority for the device boot (whether it is a CD, flash drive or hard disk), this first sector is the master boot record MBR (Master Boot Record). The MBR is always in the first sector of the boot device and occupies 512 bytes. If there is incorrect information in this sector, the computer displays an error A on the monitor. Disk read error occurred or another Reboot and select boot device or insert boot media .
The correct MBR has a code (signature) in the last two bytes - 55AA.
The presence of the code checks the BIOS and if it is not there, the disk is not bootable and we get our error.
MBR in the Victoria hard drive diagnostics program
It is important to know: If the information in the MBR's master boot record is correct, then the baton is passed on to the hidden System Reserved section.
We all know that in Windows 7 and Windows 8 operating systems, the boot occurs from the hidden System Reserved section (Reserved by the system), having a volume of 100 MB (Windows 7) and 350 MB (Windows 8).
The main purpose of the hidden partition is to store Windows 7 or Windows 8 download files.
The hidden section is always "Main" and has the "Active" attribute, which hints to BIOS - this section contains the operating system boot files. If we assign a letter to the hidden partition, we will see the boot manager, the bootmgr file and the Boot folder, which contains the boot storage configuration files (BCD). These files are hidden and to display them in the system you need to enable the display of hidden protected system files.
The bootmgr file and boot storage configuration files (BCD) are responsible for booting the operating system and if they are damaged Windows 7 or Windows 8 will not load with errors, for example, "BOOTMGR is missing. Press ctrl + alt + del" or "NTLDR is missing Press ctrl + alt + del "or A disk read error occurred press ctrl + alt + del to restart!
How to get rid of the error?
It doesn't matter if you have Windows 7 or Windows 8 installed, do the same thing .
The first reason. The hidden section System Reserved (Reserved by the system), the volume of 100 or 350 MB has ceased to be active.
If you have a Acronis Disk Director boot disk, boot the computer from it and look for such information in the program window.
The hidden System Reserved section (Reserved by the system), the volume of 100 or 350 MB must be active, marked with a red flag. On the screenshot, it is clear that it is inactive, because of this, our error may well come out at boot.
Make the Hidden System Reserved section active, click on it with the right mouse and select Mark as active.
Click Apply expected operations.
Volume "Reserved by the system will be marked as active.
We reboot and there was no error.
What to do if you do not have Acronis Disk Director boot disk? The answer is, all this can be done on the command line.
Boot from the recovery disk or the Windows 8 installation disk.
Press any key and confirm the intention to boot from the disk.
You can try Automatic System Restore (in my useless thing). Tried and returned here again! Select the command line parameter
The system has one hard disk.
Make active the hidden partition System Reserved (Reserved by the system), the amount of 350 MB.
list disk - all hard drives in the system are output.
sel disk 0 - choose a single hard disk 0
list partition - displays all available partitions on the hard disk
sel part 1 - choose section 1 - System Reserved (Reserved by the system), 350 MB
active and the partition becomes active.
If this does not help or the System Reserved section (Reserved by the system), the volume of 100 or 350 MB is already active, then try another one.
Restoring the boot record of the hard disk (MBR)
Once I had an interesting case with this error on Win 8. What I did not do, it came out again and again, but this helped me.
Boot from the recovery disk or the Windows 8 installation disk. And we do everything just like in the previous case. Loading the menu Action selection
and further we reach the command line of the Windows 8 recovery environment.
Enter Bootrec and press Enter.
We see information about the utility features: Recovery of critical disk structures. / FixMbr — The master boot record (MBR) of a Windows-compatible system partition.
Enter the commands:
Bootrec / FixMbr - a master boot record (MBR) is written that is compatible with Windows 7 or Windows 8.
Bootrec / FixBoot - utility writes the new boot sector.
Bootrec.exe / ScanOs - utility performs a search on all hard drives operating systems Windows XP, Windows 7, Windows 8. Found two.
Bootrec.exe / RebuildBcd
- scans the hard drive for the presence of installed Windows and, if found, will offer to add them to the boot menu. We agree and enter Y. If you need a second system, we enter Y again. Everything can be seen on the screenshot.
Next, we reboot and in theory, Windows 8 should boot without error!
But in my case, this did not happen and an error occurred again during the download. Then I booted from the rescue disk. Microsoft Diagnostics and Recovery Toolset (MSDaRT) (you can use a simple livecd)
and looked at the contents of the System Reserved section (Reserved by the system), 350 MB containing the main components required for booting Winows 8, such components are the bootmgr file and at the same time the BCD boot repository configuration files (located in the Boot folder). So, the Boot folder was, but there was no bootmgr boot loader, so the Windows did not boot.
I just copied the bootloader from the Windows 8 installation disk to the System Reserved section (Reserved by the system). It is done this way.
Boot from the Windows 8 installation disk and again make our way into the command line of the Windows 8 recovery environment.
We type in the command line
We see that the drive is assigned the letter G: to the hidden System Reserved section (Reserved by the system), 350 MB, Windows 8 recovery environment has assigned the letter C: (operating system files, the Windows folder is located on the E: drive).
Enter exit and exit diskpart.
In the command line we drive G:, with this command we enter the Windows 8 installation disk.
Enter the command
copy bootmgr C: \ that is, copy the bootmgr bootloader from the Windows 8 installation disk to the hidden partition System Reserved (Reserved by the system) C :. That's all.
After such manipulations, error A disk read error occurred disappeared and Win 8 booted.
If you again fail to boot, then it may be different.
Recover the Windows bootmgr file and at the same time load storage configuration files (BCD)
So the problem is in incorrect Windows boot files
Apply the bcdboot.exe E: \ Windows command (in your case the command may be different, see details below), this command restores the Windows 7 boot loader and Windows 8 bootmgr file and at the same time the BCD boot repository configuration files (contents of the Boot folder)!
Boot into the menu Select Action Windows 8
and again we go to the command line. We are determined with the letters of the disks.
Enter the command:
The drive has been assigned the letter G :, and the hidden partition is reserved by the system, a volume of 350 MB, the letter C: is assigned. The operating system files with the Windows folder are located on the E: drive, which is also visible.
and exit diskpart. In the command line we drive
bcdboot.exe E: \ Windows
Attention: This command restores the Windows 7 and Windows 8 boot loader - the bootmgr file and at the same time the BCD boot repository configuration files (contents of the Boot folder) in the hidden System Reserved section (system reserve), 100 or 350 MB, special for the operating system located on the disk E: \ Windows.
Success. Download files successfully created.
Many people here make an error and enter the bcdboot.exe C: \ Windows command and get an error Failed to copy the download files !
If our error still appears, then try another one.
Error A disk read error occurred press ctrl + alt + del to restart may appear due to file system errors on a disk with operating system C :.
You can check and fix file system errors with the Chkdsk utility, even if your operating system does not boot, we have a detailed article on this topic - Chkdsk utility . In a nutshell, you will have to boot from the recovery disk or the Windows 8 installation disk, then go to the Action selection menu,
To get to the command line, then enter the Notepad command, a notepad opens, File-> Open.
File types select All files and click on Computer .
In the window that appears, we can easily determine the hidden partition System Reserved (Reserved by the system), the amount of 350 MB under the letter C :, we can also find the disk on which the operating system is installed. Browse the contents of all disks and find on disk E: folders of the Windows operating system and Program Files.
Close the explorer and notepad and find ourselves on the command line. We check for errors section with the installed operating system, we need to enter in the command line
chkdsk E: / f
Also check the hidden partition System Reserved (Reserved by the system), the amount of 350 MB under the letter C:
chkdsk C: / f
The easiest and last option to get rid of error A disk read error occurred press ctrl + alt + del to restart
Friends, if everything that is written above has plunged you into depression and you have already said goodbye to your operating system and the programs installed not in one day, then it is in vain!
There is a way much easier than everything described above! Once I came across such a case, I tried all the known methods and it remains only to reinstall Windows, but why reinstall when you can simply allocate space on your hard disk and install the same operating system next to it. The master boot record (MBR) will be updated, the Windows boot loader will also be overwritten and automatically find the lost Windows. After installing the second Windows, the boot menu will appear, in which you can select the old operating system or the new one.
It is all done this way.
First of all, you need to allocate free space on your hard disk to install the new Windows. Boot from the Acronis Disk Director boot disk and separate 20 GB from any partition, this is exactly how much is needed to install Windows 8 64-bit.
If you have a partition with unnecessary data, you can install a second OS on it.
In my case, it was not necessary to create anything, I had a partition on a hard disk with unnecessary data of 40 GB. I booted into the Windows 8 installer
I chose the necessary partition and installed Windows 8 on it. The main thing is not to confuse the partitions and do not install the new Windows 8 on the existing one.
After installing the second Windows 8, a menu appeared in which you could select the old Windows 8 and the new, both loaded and worked fine.
If you do not need a boot menu when booting the system, then simply select Windows 8 for the default boot here for this article - How to remove the boot selection system .How can I get a working Windows back, there are a lot of programs I need?
How can I restore it?
What to do?
How to get rid of the error?
What to do if you do not have Acronis Disk Director boot disk?