How To Recover Data From Hard Disk Without OS – Analysis & Tips

What will you think of when seeing topics like “how to recover data from hard disk without OS (Operating System)” and “how to recover data from non-booting hard drive”?

According to research, we found this kind of issues are put forward by most people because they would like to seek for ways to recover data from crashed computer which can’t boot successfully since the current OS is damaged. However, a small number of people are willing to know how to get back data from a hard drive which has not installed an operating system until now.

We found the former situation is much more troublesome than the latter one after comparing them to each other. That is because the computer with crashed/damaged operating system can’t boot as usual, so users lose their entries to data saved on internal hard disk and it becomes harder to recover system files (basically because we can’t enter the computer without OS).

In contrast, if users only lose data from data disk, they’re able to perform hard drive file recovery directly by connecting this disk to a computer which is working well. Therefore, we’ll focus on the former situation in the following parts.

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Why Computer Is Unbootable

Sometimes, when you turn on your computer and plan to start working, you’ll surprisingly find the operating system on internal hard disk can’t be loaded successfully. You may get anxious and try every means to fix it at once. But our suggestion is: please stay calm and analyze the situation carefully so as to find the most appropriate solution.

How to recover data from hard disk without OS 1

To tell the truth, the direct cause of computer boot problems is OS damage/crash. Well, do you know how OS get damaged or crashed? Actually, a lot of reasons may be responsible for such issue: the loss of necessary boot files, boot partition being deleted/damaged/lost, startup parameters setting error or boot information failing to be loaded due to physical damage, etc.

Different causes will lead to different phenomena, yet, the result is the same – computer with crashed system/hard disk without OS will not boot so that we’ll lose entries to our files saved in computer earlier. Now, let’s get a closer look at the analysis of OS crash issue.

How to recover data from hard disk without OS This will show everything you need to recover data from corrupted OS disk.

System Crash Phenomena


Imagine this: you open the computer as usual trying to start OS and access data, only to find the booting process is stuck in a certain stage. Meanwhile, no matter how many times you tried to restart the computer, problem still exist. What will you do at this time?

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In fact, most users feel much depressed when encountering such disk failure. At this critical moment, some users will plan to repartition the disk and reinstall operating system on it in order to solve the current problem. Is that really practical?

Absolutely, OS reinstallation will work unless the hard disk is physically damaged and can’t be used anymore. However, we don’t suggest users to do so after encountering boot failure. The most important reasons are a). the whole reinstallation process is rather troublesome and risky and b). it will lead to serious data loss – a large number of data will missing during the OS installation.

As a result, the right things we should do under such circumstance are just staying calm (don’t rush to ask how to recover files from a crashed hard drive) and being well prepared for analyzing the cause of failure based on corresponding prompt information. In this way, we’re able to take proper measures to handle with the problem correctly.


Causes for System Crash

There are two types of reasons that will cause system crash problem: one is physical failure and the other is logical failure. Now, we want make the following facts clear to you:

  • If the hard disk without OS is damaged physically and you can’t even restart the computer at all, you’ll need to remove the disk from computer and perform a surface check. Once you confirm that the problem is resulted from serious physical damage, there’s no choice to rescue data from it but hire professional data recovery agencies and let them try recovery by opening disk.

  • On the contrary, if the system is crashed because of software failures, you’ll have great chance to recover data from this non-booting hard drive. Then, after the recovery, you can try to fix crashed OS by using all possible ways.

Note:
1.If the hard disk is damaged physically, but the degree is very light (for example, only some bad sectors), you can still try to recover data from it and then fix it.

2.If the hard disk is damaged logically, but you’ve written new data into the damaged disk by connecting it to another computer, the lost data may be overwritten and hence gone forever.


System Crash Prompts

It is said that system crash is usually caused by partition table damage. If that is the case, you will see prompts like “Invalid partition table”, “Error loading operating system” and “Non-System disk or disk error. Replace and press any key when ready”.

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Besides, you may also see following common prompt messages:

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  • NTLDR is missing
  • Missing operating system
  • Operating System not found
  • NO ROM BASIC, SYSTEM HALTED
  • DISK BOOT FAILURE, INSERT SYSTEM DISK AND PRESS ENTER.
  • Your PC ran into a problem and needs to restart. We’re just collecting some error info, and then we’ll restart for you.
  • Technical information: *** STOP: 0x000000E2 (or 0x0000008E; there’re many other error codes)
  • BSOD: Error 333 Registry Failure of Windows operating system – Host: BLUE SCREEN ERROR 0x000000CE.

You need to analyze the cause of corresponding messages, and then find suitable solutions for them when in face of above error prompts.


Tips on How to Recover Data from Hard Disk without OS

Since Windows 7 still occupies large market share, we’d like to take Windows 7 as an example to teach you how to recover data from hard disk without OS. No matter you want to recover system files, recover needed data from computer without OS or fix crashed OS, the following information will be of great help.

How to recover data from hard disk without OS 5

We often will think of reinstalling OS when encountering system problems that we can't solve. But, it is not a good way out because a). OS reinstalling is relatively troublesome and time-consuming; b). reinstallation will lead to permanent loss of some data.

Here, we roughly divide other recovery solutions into 5 types; you may as well choose the best one on the basis of your own specific situation.

Recover with Win7 System Repair Feature

Win7 system repair feature is very intelligent, so users’ intervention is often not needed. For instance, when you encounter small problems caused due to illegal shutdown, you can solve it with system repair in advanced startup options page.

How to recover data from hard disk without OS 6

After starting the system again after illegal shutdown, you’ll see a “Windows Error Recovery” screen, in which the cursor stays on the “Start Windows Normally” option by default. At the same time, you’ll see the countdown is started. The system itself allows you to start OS now, so it indicates that the problem has been repaired automatically.

In addition, the system files damage or incorrect files configuration caused by improper operations/hardware changes can also lead to system crash. And when you restart the computer again, you’ll also enter the “Windows Error Recovery” screen.

How to recover data from hard disk without OS 7

Two options are waiting to be chosen from in this screen – “Launch Startup Repair (recommended)” and “Start Windows Normally”. At this time, the cursor stays on the “Launch Startup Repair (recommended)” option by default. Obviously, Win7 wants us to select the first option to repair system automatically.

After the computer was repaired, you’ll be able to access data in internal hard drive and choose to transfer or backup important data to other storage devices.

After testing, we found the system can start normally in most cases if we choose to “Start Windows Normally”. Yet, we still suggest all of you to spend a little time in enabling the system repair since the direct start without repairing may produce some unpredictable problems. In this way, you’re able to keep system stability.


Recover with System Restore

If you both failed no matter you choose “Launch Startup Repair (recommended)” or “Start Windows Normally” on Windows Error Recovery page, you’ll need to rely on “System Restore”.

How to recover data from hard disk without OS 8

How to perform a system restore for Windows 7: press F8 key in keyboard when you’re starting Windows -> select the “Repair Your Computer” option (which is chosen by default) in “Advanced Boot Options” page -> press “Enter” to continue -> select a keyboard input method and click on “Next” -> enter user name & password and click on “OK” to see the following window.

Note: you may need to press F2, F12 or another key to enter “Advanced Boot Options” page since this depends on your computer model.


How to recover data from hard disk without OS 9

In the “System Recovery Options” page, you can easily see the “System Restore” is the second option (there’re also other options: “Startup Repair”, “System Image Recovery”, “Windows Memory Diagnostic” and “Command Prompt”). Now, please choose “System Restore directly and then follow the prompts to select a restore point to recover.

After that, please restart the computer to see if it works or not. Under normal circumstances, this method is capable of repairing unbootable system and other issues.

Note:
you need to satisfy two prerequisites before you can use “System Restore” feature
a). system protection function has already been enabled on system partition;
b). system restore point(s) has already been created, either manually or automatically.

Recover with System Image Recovery Feature in Win7

You’ll need to resort to “System Image Recovery” function if your system user profile is damaged due to virus attack or other reasons. The way to find and enable “System Image Recovery is exactly the same to previous one.

Note: likewise, to use this feature for recovery, you must create a system image before it crashes. Besides, if you have important files, please backup them in advance by trying to enter WinPE because the files generated during system image recovery will overwrite your personal data.


Recover with a Recovery Disc or Installation Disc

If you’re “Lucky” enough, the above mentioned methods may be not helpful since your system partition is seriously damaged. In this case, a Win7 recovery/installation disc is needed (a recovery disc is also known as a restore disc, repair disc, boot disc or rescue disk).

How to recover data from hard disk without OS 10

How to do: start computer with the drive/disc -> enter the “System Recovery Options” window -> check “Restore your computer using a system image that you created earlier.” -> the left operations are similar to above methods.

The WinRE in system partition does not work due to failures, so the system will automatically call WinRE in system repair disc, instead.

Recover with Power Data Recovery Boot Disk

If you prefer to know how to recover files from a crashed hard drive first rather than repair system immediately, this method would be your best choice. In fact, we suggest all users to recover files from crashed hard drive before doing anything else to try to repair system. That is because the repair itself or any errors during the repair would damage your data and make them unrecoverable.

How to recover data from hard disk without OS:

Download Now

How to recover data from hard disk without OS 11

Step 1: download corresponding MiniTool Power Data Recovery Bootable Edition and burn it into a CD/DVD or USB flash drive.

Step 2: restart computer and press F2 or another key (depending on your computer model) to enter BIOS menu. Change boot settings to make your computer boot from this recovery CD/DVD or USB flash drive.

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Step 3: choose “MiniTool Power Data Recovery V7.0” in welcome window to see main interface of software.

How to recover data from hard disk without OS 13

Step 4: choose a suitable functional module and click on it to enter. Then, follow instructions in operating interfaces to continue data recovery in the way you want.

When all operations are completed, you can use whatever ways you think useful to repair OS or reinstall OS.

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You can also choose to remove the internal hard disk from computer and then connect it to another one (working well) to recover data more easily. But you need to confirm that your internal hard disk allows for removing and you must be gentle enough during removing and connecting to avoid physical damage and permanent data loss.

Note: no matter you’re seeking answers to how to recover hard disk without OS or how to fix a crashed laptop, the solutions provided here are useful.


Precautions


Note following things to decrease the possibility of OS crash:

  • Monitor the occupancy of system resources at any time.
  • Choose safe ways to remove installed programs when necessary.
  • Check its compatibility with system carefully each time you install a new software/program.
  • Also, you need to protect the shared and used DLL files that already exist before installation to prevent them from being overwritten by new data.
  • Carefully study the prompt messages and analyze the possible reasons in the event of illegal operation and blue-screen.


Common problems related to partition recovery and our solutions: