Windows 10: INACCESSIBLE BOOT DEVICE after Win10 Update

Specs:

Intel i7 4770k
GTX 1070
Win 10 Pro
msi z87 g45
Windows installed in december on a new SSD
Also have 1 storage SSD and 4 HDD in two different raid.

All formatted in December after having issues unrelated to current issue. Windows installed fresh on the new SSD. Have been running fine until now.


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Hello, decided to restart the PC today and got BSOD with Inaccessible Boot Device.

I tried system restore to before the windows update but all of the restore points fail to be restored (Tried several).

After following this thread:
Inaccessible Boot Drive after Update? Solved - Windows 10 Forums

i seem to have ****ed it up a bit extra, not thinking about how that user had different volumes than me.

Sometimes it now boots into Inaccessible Boot, sometimes it boots into a BSOD saying something about missing BCD.

I can still access cmd if i go via a restore USB.


Running List Volume from recovery USB shows:

Volume 0: Ltr: J Label: U3 System Fs: CDFS Type: CD-ROM Size: 95 MB Status: Healthy Info: Blank

Volume 1 Ltr C Label SpdDisk Fs NTFS Type Partition Size 238 GB Status Healthy Info Blank

Volume 2 Ltr I Label Blank Fs NTFS Type Partition Size 450 MB Status Healthy Info Hidden

Volume 3 Ltr D Label System Rese Fs NTFS Type Partition Size 549 MB Status Healthy Info Blank

Volume 4 Ltr H Label SysDisk Fs NTFS Type Partition Size 465 GB Status Healtht Info Blank

Volume 5 Ltr E Label PrimRAID Fs NTFS Type Partition Size 1863 GB Status Healthy Info Blank

Volume 6 Ltr F Label SecRAID Fs NTFS Type Partition Size 465 GB Status Healthy Info Blank

Volume 7 Ltr G Label ESD-USB Fs FAT32 Type Removable Size 14 GB Status Healthy Info Blank

Notes: In windows SpdDsk was assigned S (Storage SSD)
SysDisk was assigned C and is the system disk (SSD)
SecRaid was assigned H

Reassigning and restarting shows them back to wrong labels, the reassign dont seem to stick, cant make SysDisk list as C after a restart, not sure if this matters.

Is there any other info that could be useful?
Help would be lovely!!

Since i reinstalled windows in december and formatted all drives im not super keen on doing it again because windows update sucks. It takes a bit to set up things as I use a decent chunk of customization, personal rainmeter desktop and use classicshell to have an old-style startmenu etc. Also sucks reinstalling all applications.

Not sure if highlighting users work but @FreeBooter you seem clever, please save me *Smile

edit: Sorry for poor formatting but have to write from phone since PC is DEAD *Sad

edit: forgot to set mobo to raid after resetting it. updated list volume to show correct volumes.

:)

 

win10 Inaccessible boot device, on desktop after adding ssd as os and hdd as data disk.

Hi,

This issue could be related to a corrupted boot records. To get this issue sorted,
we’ve got a few handy solutions for you to try:
Troubleshooting Windows 10 failure to start.

Please post back with the status of the issue. We will be glad to assist you further.

 

inaccessible boot drive. After Windows 10 update on 28/8/17

As above. It's draining my will to live.

Paul M. INACCESSIBLE. BOOT. DRIVE. BSOD. After Win10 update on 28/8/17

***Post moved by the moderator to the appropriate forum category.***

 

Hi fullofdespair


Each time you restart your computer into Windows Recovery Environment the letter assignment for each partitions may be different you need to use List Volume command to make sure drive letters use by below command are correct.


Code: bcdboot C:\Windows /s D: /f ALL[/quote]
You may need to replace C: drive letter with Windows OS installed partition drive letter.
You may need to replace D: drive letter with "System Rese" partition drive letter.


You can use Dir command to make sure which drive letter assigned to Windows OS installed partition.


Code: Dir /b C:\[/quote]

 

You may need to replace C: drive letter with Windows OS installed partition drive letter.
You may need to replace D: drive letter with "System Rese" partition drive letter.


You can use Dir command to make sure which drive letter assigned to Windows OS installed partition.


Code: Dir /b C:\[/quote] [/quote] Did it, said ”Boot files sucessfully created.” I then closed cmd (started via recovery USB) and chose option ”Continue to Windows”.

After reboot I got screen saying

Code: Recovery Your Pc couldbt start properly After multiple tries the operating system on your Pc failed to start so it need to be repaired. Error code: 0xc0000001 You’ll need to use recovery tools. If you dont have any i atallatuon media files (like a disc or usb device) contact your pc administrator or pc/device manufacturer.[/quote] I believe this might be due to me messing things up further when i followed your advice on the other thread without making sure my volume names matched up, or maybe just due to my spam restarts when trying to fix this.

I chose Press F8 for startup settings, then selected option with Safemode + Network. (”Press enter to start again” was other option) this led me back to Inaccessible Boot Device error, after which PC auto-restarted and brought me bacl to the Recovery error screen written out earlier.

Before I messed up following your other thread the reboot after inaccessible boot device brought me to a screen similar to USB Boot, with menu allowing things like system restore, etc.


What Next?

 

1) Find a flash drive that you can format ( > or = 8 GB)
2) Create a bootable windows 10 iso:
Download Windows 10
4) Insert the flash drive into any USB port
5) Open the BIOS and temporarily change boot order so that you can boot using the flash drive.
6) When the iso loads choose language, time, currency, and keyboard, or click next
7) In the left lower corner click "repair your computer"
8) Click troubleshoot
9) Click command prompt
This should open: Administrator: X:\Windows\system32\cmd.exe > X:\Sources>

For all of the steps please use a camera or smart phone camera to take pictures and post images into the thread.

10) type: bcdedit | find "osdevice"
11) This may display osdevice partition=C:
12) type: diskpart
13) type: list disk
14) type: list volume
15) look under the column heading Fs for any volume that displayed RAW instead of NTFS
16) type: chkdsk /f /r G: (change G to the drive letter of the volume displaying RAW)
It may display "The first NTFS boot sector is unreadable or corrupt."
This may then convert the RAW volume to NTFS.
17) Type: exit
18) reboot to open the Windows advanced troubleshooting menu > command prompt > Administrator: X:\windows\system32\cmd.exe > X:\Sources>
19) type: bootrec /rebuildbcd
It may display:
Scanning all disks for Windows installations.
Please wait, since this may take a while...
Successfully scanned Windows installations.
Total identified Windows installations: 1
[1] D:\Windows
Add installation to boot list? Yes(Y)/No(N)/ALL(A):
20) Type: Y
The operation completed successfully.
X:\Windows>
21) Type: exit
22) reboot
See if the inaccessible boot device problem was fixed.

If the above did not fix the inaccessible boot device the next step is to remove the recent update:
23) Open command prompt > Administrator: X:\Windows\system32\cmd.exe > X:\Sources>
24) From the first command displaying the partition if the drive letter is different than C: please use the displayed drive letter for the next step
25) type: DISM /image:G:\ /cleanup-image /revertpendingactions (change G to the applicable drive letter)
26) This should remove the latest update and fix the inaccessible boot device.
27) If this does not fix the inaccessible boot device plan a registry repair.

Report into the thread your progress with images of the above steps.

 

Are you booting your computer with BIOS or UEFI firmware mode?

 

techsupport - Album on Imgur

uefi

 

Did you check your Boot order in the bios ?

INACCESSIBLE BOOT DEVICE on startup Solved - Windows 10 Forums

 

boot order is correct, to be sure ive often used manual pick for boot

 

Code: Recovery Your Pc couldbt start properly After multiple tries the operating system on your Pc failed to start so it need to be repaired. Error code: 0xc0000001 You’ll need to use recovery tools. If you dont have any i atallatuon media files (like a disc or usb device) contact your pc administrator or pc/device manufacturer.[/quote] Looks like we have repaired BCD data store because above error is not cause by corrupted BCD data store.

The 0xc0000001: A required device isn’t connected or can’t be accessed boot error message caused by a wide variety of causes, with the most common one being system file corruption, or damaged memory.




Please boot your computer with Windows Setup Media and from Windows Recovery Environment start the Command Prompt.

Please type below command into Command Prompt and press Enter key.

Following command will fixes errors on the disk and locates bad sectors and recovers readable information.


Code: Chkdsk D: /r[/quote]

Please replace partition letter D: with Windows installed partition letter. When computer boots into Windows Recovery Environment (WinRE) environment the drive letter assign to Windows partition may not be C: drive letter because Windows 7, 8 , 8.1 and 10 creates a separate system partition when it's installed from scratch. The system partition contains boot files WinRE assigns the system partition the C: drive letter and the Windows installed partition will be assign any other drive letter usually D: drive letter is assign to Windows installed partition. The Bcdedit /enum | find "osdevice" command can be use to find out the drive letter of the Windows installed partition the output of the Bcdedit command is similar to this osdevice partition=D:. The drive letter after partition= is the drive letter of the Windows partition.



Please boot your computer with Windows Setup Media and from Windows Recovery Environment start the Command Prompt.

Please type below command into Command Prompt and press Enter key.

The following command scans integrity of all protected Windows system files and repairs files with problems when possible.

Code: Sfc /Scannow /OFFBOOTDIR=D:\ /OFFWINDIR=D:\Windows[/quote]

Please replace partition letter D: with Windows installed partition letter. When computer boots into Windows Recovery Environment (WinRE) environment the drive letter assign to Windows partition may not be C: drive letter because Windows 7, 8 , 8.1 and 10 creates a separate system partition when it's installed from scratch. The system partition contains boot files WinRE assigns the system partition the C: drive letter and the Windows installed partition will be assign any other drive letter usually D: drive letter is assign to Windows installed partition. The Bcdedit /enum | find "osdevice" command can be use to find out the drive letter of the Windows installed partition the output of the Bcdedit command is similar to this osdevice partition=D:. The drive letter after partition= is the drive letter of the Windows partition.


If the error is caused by damaged hard disk cables, try any of the following tips to fix the error:

• Try a different port for the SATA/IDE cables
• If you have more than 1 HDD, leave only the HDD with Windows installed and test multiple SATA/IDE ports and cables

If the HDD cables and ports are not damaged, the issue can also be from the hard disk itself.

 

For these steps please use a camera to take pictures and post images of the results into the thread:
1) open command prompt > Administrator: X:\Windows\system32\cmd.exe > X:sources:>
2) type: diskpart
3) type: list disk
4) type: select disk 0
5) type: list volume
6) type: select disk 1
7) type: list volume

 

Looks like we have repaired BCD data store because above error is not cause by corrupted BCD data store.

The 0xc0000001: A required device isn’t connected or can’t be accessed boot error message caused by a wide variety of causes, with the most common one being system file corruption, or damaged memory.




Please boot your computer with Windows Setup Media and from Windows Recovery Environment start the Command Prompt.

Please type below command into Command Prompt and press Enter key.

Following command will fixes errors on the disk and locates bad sectors and recovers readable information.


Code: Chkdsk D: /r[/quote]

Please replace partition letter D: with Windows installed partition letter. When computer boots into Windows Recovery Environment (WinRE) environment the drive letter assign to Windows partition may not be C: drive letter because Windows 7, 8 , 8.1 and 10 creates a separate system partition when it's installed from scratch. The system partition contains boot files WinRE assigns the system partition the C: drive letter and the Windows installed partition will be assign any other drive letter usually D: drive letter is assign to Windows installed partition. The Bcdedit /enum | find "osdevice" command can be use to find out the drive letter of the Windows installed partition the output of the Bcdedit command is similar to this osdevice partition=D:. The drive letter after partition= is the drive letter of the Windows partition.



Please boot your computer with Windows Setup Media and from Windows Recovery Environment start the Command Prompt.

Please type below command into Command Prompt and press Enter key.

The following command scans integrity of all protected Windows system files and repairs files with problems when possible.

Code: Sfc /Scannow /OFFBOOTDIR=D:\ /OFFWINDIR=D:\Windows[/quote]

Please replace partition letter D: with Windows installed partition letter. When computer boots into Windows Recovery Environment (WinRE) environment the drive letter assign to Windows partition may not be C: drive letter because Windows 7, 8 , 8.1 and 10 creates a separate system partition when it's installed from scratch. The system partition contains boot files WinRE assigns the system partition the C: drive letter and the Windows installed partition will be assign any other drive letter usually D: drive letter is assign to Windows installed partition. The Bcdedit /enum | find "osdevice" command can be use to find out the drive letter of the Windows installed partition the output of the Bcdedit command is similar to this osdevice partition=D:. The drive letter after partition= is the drive letter of the Windows partition.


If the error is caused by damaged hard disk cables, try any of the following tips to fix the error:

• Try a different port for the SATA/IDE cables
• If you have more than 1 HDD, leave only the HDD with Windows installed and test multiple SATA/IDE ports and cables

If the HDD cables and ports are not damaged, the issue can also be from the hard disk itself.[/quote] Imgur: The magic of the Internet

there should be no issues with the drives themselves or the motherboard or the connectors or cables

issue definitely relates to microsoft writing useless code that breaks their own OS on updates + my shitty job at trying to solve it myself which made it worse.

Greatly appreciate your help so far

 

Imgur: The magic of the Internet

 

I think i know what is the problem you said you are booting your computer UEFI mode the "System Rese" partition should be FAT32 file system partition its NTFS partition. We need to delete and create new "System Rese" partition.


From Command Prompt execute below commands:

Code: Diskpart List Disk Select Disk 0 List Partition Select Partition X Delete Partition Create Partition EFI FORMAT FS=FAT32 LABEL="System" Assign Letter=D List Volume Exit bcdboot C:\Windows /s D: /f ALL[/quote] Use "List Disk" command to find out disk number assign to Windows 10 installed drive.

Replace number 0 zero with disk number assign to Windows 10 installed drive

Use "List Partition" command to find out "System Rese" partition assigned number.

Replace X letter with "System Rese" partition assigned number.

You may need to replace C: drive letter with Windows OS installed partition drive letter.

I have to warn you Diskpart tool is very dangers so please make sure to execute Diskpart command carefully.