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Strange Dual-Boot Menu Problem
I have a dual-boot problem. My desktop PC has two harddrives, Drive 0 and Drive 1. Drive 0 (my primary boot drive) has a single partition containing Windows 10 on Drive C:. Drive 1 has two partitions: a 100MB System Reserved partition containing the MBR, etc., and a large partition containing Windows 7 on Drive D:.
The Windows 10 OS was upgraded from Windows 7. The Windows 7OS on D: is a separate copy (not the copy used for the upgrade to Windows 10).
Both operating systems work fine, but the dual-boot menu that gives access to them is behaving very strangely. After a hard boot, the computer invariably goes straight into Windows 10. When I do a warm boot, however, the dual-boot menu is displayed, and I can choose either OS.
I have tried extending the display interval in Startup &Recovery, but it made no difference.
The odd thing is that, to begin with, the dual-boot menu was appearing correctly after every boot. The problem may have started after a Windows 10 update, but I am not sure.
Any suggestions for fixing the dual-boot menu problem?