Windows 7 and Windows 10 on separate drives

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jonaspjkp

Oct 1, 2018
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I have Windows 7 and Windows 10 on separate SSD hard drives. The problem is when I have both drives plugged in, it is not possible to start Windows 10. Windows 10, however, works if I disconnect the disk with Windows 7. In the boot menu I can see both drives. Looking in boot option in BIOS the drive with Windows 10 is number 1 and the drive with Windows isn't there. Nevertheless, Windows 7 starts as soon as I leave the BIOS....
 
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Math Geek

Math Geek

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Oct 15, 2014
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you should have gotten a dual boot menu when you installed the second os. should be win 7 first, then win 10 installed second then you'd have no issues.

sounds like you installed each one without the other drive installed which caused the issue. you can chose "boot menu" on start-up to select the right drive if you wish. usually it is f12 or some other f key you have to hit. easiest way consider how you are set up now.
 
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J

jonaspjkp

Oct 1, 2018
3
0
10
Yes, It's correct, I installed each OS without the other drive installed. As I said, "In the boot menu I can see both drives. Looking in boot option in BIOS the drive with Windows 10 is number 1 and the drive with Windows 7 isn't there. Nevertheless, Windows 7 starts as soon as I leave the BIOS.... " Below are two pictures showing this.

http://i68.tinypic.com/o60idd.jpg
http://i63.tinypic.com/240zkgy.jpg
 
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Scottray

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Jul 14, 2016
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You borked your install of 2 OSes, neither OS knows that the other OS is available. I'd suggest that you uninstall Windows 7 and make sure the PC boots correctly with Windows 10. Then, google some guides on how to install Windows 7 as a second OS. Make sure it includes a boot manager.
 
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