how to fix INACCESSIBLE_BOOT_DEVICE Error on Windows 11 Laptop Without External Devices

Question

how to fix INACCESSIBLE_BOOT_DEVICE Error on Windows 11 Laptop Without External Devices

kignee 20

So I was tweaking (fixing the charging port, which required disconnecting everything, specifically the ssd KBG50ZNT256G LS KIOXIA, besides backup battery) with my laptop (Acer Aspire A315-59). after everything was done I booted up like normal and was greeted with bsod INACCESSIBLE_BOOT_DEVICE (it's actually green and mentions something about the pre-test user assembly). BIOS sees the ssd but windows boot manager does not. diskpart doesn't see the disk nor does any recovery system in windows. I now have no way of reinitialising the disk or doing anything with it besides plugging it out and back in (it didn't work obviously, for both disk slots), all I have at hand is command line in windows recovery menu. Microsoft diagnostics and recovery toolset says MSVCP100.dll, MSVCR100.dll and MSDartCmn.dll are not found.

oh and cmd runs on X:\ directory.

disk part says hard drives not found.

BIOS ver. 1.28 Intel GOP Driver 21.0.1046 Microsoft windows ver. 10.0.22621.1 in cmd

I really need to fix this because of work stuff so I would very appreciate if anybody could help with this asap.

kignee 20 Reputation points

2024-10-22T18:05:47.5133333+00:00

if absolutely necessary I can get access to another pc btw, but if the problem can be fixed without it that'd be great
Monsieur collinse 0 Reputation points

2025-07-19T02:31:21.82+00:00

I managed to fix this issue of my 1hour old windows installation. I had installed the latest os build and got the same BSOD after I restarted to install downloaded updates. What worked was force shutting down the computer on this blue screen about two times, until Automatic Repair started and it fixed it and booted to the system without me having to play with CMD and windows recovery tools manually. Let me now play a game with my installation to see how far I will go without any issue like this.
LKEEN 0 Reputation points

2025-08-14T22:42:38.1133333+00:00

Apparently the same issue happened to me but i just solved it by re-enable Hyper-V via safe boot. Im not totally sure what is the cause with Hyper-V disabled.

Answer accepted by question author

S.Sengupta 32,021 MVP Volunteer Moderator

Check for damaged or loose SATA connections.

May be the BCD got corrupted. Open Command Prompt as Admin and copy-paste the following commands after entering the Enter command in each case:

bootrec /fixmbr

bootrec /fixboot

bootrec /scanos

bootrec /rebuildbcd

You may also run Kioxia SSD diagnostic tools for diagnostics.

kignee 20 Reputation points

2024-10-23T14:35:16.1066667+00:00

So the thing is that windows shell doesn't recognise the disk and it's on nvme. diskpart and bootrec can't help in that case. BIOS does recognise the disk but boot manager does not.
jojostarbux 0 Reputation points

2025-12-03T01:14:02.3+00:00

I ran the above commands and encountered "Access Denied" when attempting to fixboot, how do I fix this ??

1 additional answer

Your answer

kignee 20 Reputation points

2024-10-22T18:05:47.5133333+00:00

if absolutely necessary I can get access to another pc btw, but if the problem can be fixed without it that'd be great
Monsieur collinse 0 Reputation points

2025-07-19T02:31:21.82+00:00

I managed to fix this issue of my 1hour old windows installation. I had installed the latest os build and got the same BSOD after I restarted to install downloaded updates. What worked was force shutting down the computer on this blue screen about two times, until Automatic Repair started and it fixed it and booted to the system without me having to play with CMD and windows recovery tools manually. Let me now play a game with my installation to see how far I will go without any issue like this.
LKEEN 0 Reputation points

2025-08-14T22:42:38.1133333+00:00

Apparently the same issue happened to me but i just solved it by re-enable Hyper-V via safe boot. Im not totally sure what is the cause with Hyper-V disabled.
kignee 20 Reputation points

2024-10-23T14:35:16.1066667+00:00

So the thing is that windows shell doesn't recognise the disk and it's on nvme. diskpart and bootrec can't help in that case. BIOS does recognise the disk but boot manager does not.
jojostarbux 0 Reputation points

2025-12-03T01:14:02.3+00:00

I ran the above commands and encountered "Access Denied" when attempting to fixboot, how do I fix this ??

Answer 1

Hello,

The “INACCESSIBLE_BOOT_DEVICE” Blue Screen of Death (BSOD) error indicates that Windows has lost access to the system partition during startup.

You could try to check the setting below:

Check Physical Connections: Since you’ve worked on the laptop internals, ensure that the SSD is properly seated in its connector. Double-check both the data and power connections if applicable.

BIOS Settings: Verify that the BIOS is configured properly to boot from the SSD. Ensure that the SATA mode is set correctly (e.g., AHCI). Sometimes, a BIOS update or reset can change these settings.

Boot in Safe Mode: If possible, try booting into Safe Mode to see if Windows can load with minimal drivers and services.

Automatic Repair: Use the Windows Recovery Environment to perform an automatic repair. This might fix boot-related issues.

Also check the information in the link below:

How To Fix an Inaccessible Boot Device on Windows 10/11 (helpdeskgeek.com)

Best Regards,

Hania Lian

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