INACCESSIBLE_BOOT_DEVICE
What is this error?
Windows can't access the boot device (your system drive). The storage controller can't read the disk Windows is installed on.
Common causes
- changed SATA/NVMe mode in BIOS
- Windows update broke storage driver
- corrupted BCD
- failing system drive
- loose SATA/NVMe connection
How to fix it
- Check BIOS storage mode (AHCI vs RAID)
- run startup repair
- check drive connections
- restore BCD
Too many steps? Crashless can diagnose this automatically — checks your drivers, temps, VRAM, and 400+ known error patterns.
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Bug check 0x0000007B (INACCESSIBLE_BOOT_DEVICE) means Windows can't read the drive it's installed on during boot. This is a boot failure — your PC can't start Windows.
The most common cause is accidentally changing SATA mode in BIOS from AHCI to IDE (or vice versa).
How to fix it:
- Enter BIOS and check the SATA/storage mode — if it changed from AHCI to RAID or IDE, change it back. This is the #1 fix
- Check physical connections — make sure SATA cables and NVMe drives are firmly seated
- Boot from Windows USB and run Startup Repair
- From recovery Command Prompt: 'bootrec /fixboot', 'bootrec /fixmbr', 'bootrec /rebuildbcd'
- If it happened after a Windows update, boot into Safe Mode (if possible) and uninstall the recent update
- Check if the drive is visible in BIOS — if BIOS can't see it, the drive may have failed
- For NVMe drives: try a different M.2 slot, update BIOS, or check if the NVMe needs a driver that's not built into your Windows version
When to seek help
If this error keeps happening after trying the fixes above, it may point to a deeper hardware or system issue. Consider professional help if:
- The crash occurs across multiple games or applications
- You see the same error after a clean Windows install
- Your PC is less than a year old (could be a warranty issue)
- You smell burning or hear unusual sounds from your PC
Or let Crashless do the deep analysis for you -- our AI checks drivers, temps, event logs, and 400+ known patterns automatically.
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