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11 ways to improve Windows boot time for quicker startup
On the contrary, if your system has an HDD, you'll notice a significant change in the boot time. Also, in some systems, the OS selection menu doesn't appear when fast startup is enabled.
PC Magazine5y
DOS startup options
Starting with DOS 6, there were multiple startup options for the CONFIG.SYS and ... configuration files could be bypassed for a "clean boot." To troubleshoot a new driver or TSR, CONFIG.SYS ...