Windows Fixes

BSOD & Inaccessible boot device error

• check RAID or AHCI in bios settings (if RAID, change to AHCI)

Causes ( The most likely)

1. BIOS/UEFI is resetting itself

This is the #1 cause when it happens repeatedly.

Common triggers:

• Dead or weak CMOS battery (CR2032) ← very common

• Power loss / unplugged PSU

• Laptop main battery disconnects

• BIOS update or failed BIOS save

When that happens:

• BIOS loses saved settings

• Reverts to OEM defaults = RAID

• Windows boots → INACCESSIBLE_BOOT_DEVICE

That’s why:

• You fix it (set AHCI)

• It works for a while

• Then suddenly breaks again

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2. Fast Boot / Modern Standby firmware bug

Some systems:

• Re-apply OEM defaults during “deep sleep”

• Especially Dell / HP laptops

So after:

• Sleep

• Hibernate

• Battery drain

→ RAID gets re-enabled.

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3. You didn’t enable AHCI driver properly

If Windows wasn’t fully prepared:

• It may boot sometimes

• Then fail after updates or power cycles

But this alone does NOT flip BIOS settings, so this is secondary.

Type Bitlocker password whenever restart or shutdown everytime

• Fix by enabling or activating TPM in BIOS.