I'll do a proper write-up of this later, but for now, here is a short summary of a nasty edge case you may see.
First, one way this can happen:
1. Your BIOS loses its settings.
2. No problem, all that stuff's stored in the EFI partition.
3. ...except for the SATA IDE vs AHCI setting, for obvious reasons.
4. Were you using SATA-AHCI? You're probably using SATA-IDE now.
5. Did you try to boot before you figured that out?
6. If you did, it failed. Did you let Windows try to fix it?
7. If
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