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If you don't detach disk 0 when installing Win 7 on disk 1, it will put the win 7 boot loader on win 10 (disk 0). Then you can only boot win 7 with win 10 installed. They won't be independent disks / OSs.
If you don't detach disk 0 when installing Win 7 on disk 1, it will put the win 7 boot loader on win 10 (disk 0). Then you can only boot win 7 with win 10 installed. They won't be independent disks / OSs.
Why don't you buy a small SSD (128G - ~US$30) SSD for windows and programs on it and use the HDD for data only. You will have the speed of a SSD and the space of a HDD at low cost.
PNY CS900 120GB 2.5" SATA III INTERNAL Solid State Drive (SSD) - SSD7CS900-120-RB - Newegg.com
I can guide you as I have done it many times.
Please mark this thread as Solved.
because a ssd is expensive in Hong Kong. I can only replace it with a used hard drive with the same capacity. thanks to my dad.