STOP 0x0000007B

INACCESSIBLE_BOOT_DEVICE

Windows started booting and then lost access to the drive it lives on. This almost always follows a change: a BIOS storage-mode switch (AHCI/RAID), a missing storage driver, moving the disk to new hardware, or a botched update.

Worth knowing: This one usually strikes at boot, so you may be reading this from another device — the fixes above all work from the Windows recovery screen.

Likely causes, most common first

The BIOS SATA/NVMe mode was changed (AHCI ↔ RAID/Intel RST/VMD)
A Windows update or driver change removed the storage driver the boot drive needs
The disk was moved to a different PC or controller
Boot configuration data corruption

How to fix it

1. Undo any BIOS storage-mode change moderate

Reboot into the BIOS (usually Del or F2 during startup).
Find the SATA/storage mode setting (AHCI, RAID, Intel RST/VMD) and set it back to what it was before the crashes began.
Save and reboot. If you're not sure it changed, try the other mode once — it's safe to switch back.

2. Run Startup Repair moderate

Boot fails twice in a row → the blue Recovery screen appears (or boot from a Windows USB stick).
Choose Troubleshoot → Advanced options → Startup Repair.
If that fails, choose Command Prompt and run: bootrec /fixmbr, then bootrec /fixboot, then bootrec /rebuildbcd

3. Uninstall the most recent update easy

From the Recovery screen: Troubleshoot → Advanced options → Uninstall Updates.
Remove the latest quality update first; if that doesn't help, the latest feature update.

The four parameters on the blue screen

Windows shows four hex numbers with this stop code. Here's what each means — our analyzer decodes them automatically from your dump file.

Parameter 1	Address of a structure naming the boot device
Parameter 2	Reserved
Parameter 3	Reserved
Parameter 4	Reserved

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