This happens, when you install windows with multiple drives present in the system.
OS is installed onto 120GB SSD, but bootloader is placed on 1TB HDD.
If you remove 1TB drive from system, your pc would not boot anymore.
What you have to do is to:
- 1. Shrink C: partition by 300MB;
2. Create a new partition in freed up space, format ntfs, assign some drive letter (for example X: ) ;
3. mark X: partition active;
4. create bootloader files onto X: (execute from elevated command prompt or you'll get an error) :5. Shutdown your pc, disconnect all drives except OS drive (120GB SSD);
6. Verify boot sequence in BIOS;
7. Try to boot up your system;
8. If everything boots up normally, then shutdown...