Fix: Required Device Isn’t Connected or Cannot Be Accessed

Posted by @Eileen

January 18, 2019

There are two efficient ways to fix required device isn’t connected or cannot be accessed. You can choose one based on your own situations.

The case: required device is inaccessible

“My notebook won't boot this morning. It's running Windows 8 and goes straight to an error screen. Says it can't boot and for me to search 'bad system configuration info' for more information. It then reboots to a recovery screen which says ‘A required device isn't connected or can't be accessed. Error code: 0xc000000f.’

I've got options for try again (which repeats the same thing) or start-up settings which aren't particularly useful. Anyone any idea what's up with it? At work at the moment but will test ram and hard disk when I get home.”

Have you ever encountered the same problem mentioned above? When you turn on your computer, the computer that was working normally suddenly shows a blue screen with the following error message: “Your PC needs to be repaired. A required device isn't connected or cannot be accessed 0xc00000f”.

Required Device Inaccessible

After using the methods recommended in the lower left corner, you can find: Enter doesn’t work, F8 doesn’t work, F9 goes to Automatic Repair but nothing worked. Your computer will be stuck on this page and refuses to boot. There are multiple reasons for this issue like invalid configuration data, improper computer shutdown, and corrupted OS disk, etc.

No matter what the reason is, you should solve this problem immediately. How to fix required device isn’t connected or cannot be accessed? Read the following contents carefully and your problem will be solved soon.

Top two ways to fix required device isn’t connected or cannot be accessed

Here are two simple and proven ways to fix the problem that a required device isn’t connected or cannot be accessed in Windows 10. You can choose one that suits you best. Now, let’s learn the detailed steps.

Method 1. Run an automatic Startup Repair

Step 1. Start your PC, press Power button for 5 - 10 seconds when the manufacturers logo disappears and Windows is about to load. Then repeat this action.

Step 2. Windows will automatically enter the Recovery Environment when you turn on your computer for the third time. Click Advanced options in the recovery screen.

Advanced Options

Step 3. Click Troubleshoot on the Choose an option screen.

Step 4. Click Advanced options.

Step 5 Click Startup repair. Then follow the onscreen instruction.

If the Windows 10 Startup Repair not working, you can try next method to fix the problem of the boot selection failed - a required device is inaccessible.

Method 2. Run a Startup Repair via Command Prompt

Before you do, you need a Windows installation DVD. If you don’t have, you can create a bootable disc on a well-functioning PC. Press F8 while booting the system to go into the Windows Recovery menu.

Step 1. Go TroubleshootAdvanced OptionsCommand Prompt.

Commant Prompt

Step 2. In command prompt, type the following commands in order:

  • bootrec /fixmbr

  • bootrec /fixboot

  • bootrec /scanos

Note: If you receive that "Total identified Windows installations = 0", you can type the following commands:

  • bcdedit /export C:\bcdbackup

  • C:

  • cd boot

  • attrib bcd -s -h –r

  • ren C:\boot\bcd bcd.old

Step 3. Rebuild Boot Configuration Data by typing following command:

bootrec /rebuildbcd

Step 4. Press A to add installation to boot list and then press Enter.

Add Installation

Step 5. Close system and restart your computer.

However, these two ways don’t always work fine. Some people complaint that the computer still can’t boot after taking these measures. In addition to this, a little careless will cause data loss because of complex operating steps.

Fortunately, you can do a system backup to avoid data loss. If the two ways mentioned above don’t work, you also can restore system to the normal working time via system backup image.

Freeware to backup system in Windows 10/8/7

If you are looking for Windows backup utility, AOMEI Backupper Standard is recommended. With its easy steps and simple interface, you can create a system image with a few clicks. Various operating systems are supported by this freeware like Windows 10/8.1/8/7, Windows Vista and Windows XP.

With its scheduled backup, you can keep your data up to date. What’s more, incremental backup and differential backup in this freeware can help you backup changes only. Don’t hesitate to download this freeware! Here are detailed steps.

Step 1. Install and launch this backup utility.


Step 2. Click Backup and System Backup subsequently.

System Backup

Step 3. You can modify the Take Name by your needs. The required system partitions are selected by default in Step 1. Select the destination path (G:\) in Step 2. Then click Start Backup.

Start Backup

Step 4. When the System Backup Progress is completed, you can click Finish.



  • When you click Backup Options in Step 3, you will face six options: General, Compression, Splitting, Intelligent Sector, VSS and Other. These features can be set by your needs. Enable encryption for backups (supported by AOMEI Backupper Professional) under General tab can help you create a backup encryption.

  • In Step 3, Schedule can help you setup an automatic backup. For schedule settings, you can choose Daily, Weekly, Monthly, Event triggers, USB plug in or Real-time Sync. The last three options require you to upgrade to the advanced version.

  • In Step 3, Scheme (in paid version) means the program will delete older backups automatically.

  • If you click Check backup integrity on completion in Step 4, the program will check the data integrity of the backup after backing up system.

  • After backing up, you can select Shut down PC, Restart PC, Hibernate or Sleep in Step 4.

  • If you want to restore system later, you can go Home ﹥ the System Backup task ﹥ Restore.


The two methods mentioned in this article can help you fix required device isn’t connected or cannot be accessed. Remember that developing a good habit of backing up is fairly important for disaster recovery. For backup utility, AOMEI Backupper Standard can be your ideal choice.