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In Windows 3.1, additional options are available, such as /3, which starts Windows in 386 enhanced mode, and /S, which starts Windows in standard mode [2] A startup sound was first added in Windows 3.0 after installing the Multimedia Extensions (MME), [3] but not enabled by default until Windows 3.1.
Safe mode is a diagnostic mode of a computer operating system (OS). It can also refer to a mode of operation by application software . Safe mode is intended to help fix most, if not all, problems within an operating system.
The BIOS uses the boot devices set in Nonvolatile BIOS memory , or, in the earliest PCs, DIP switches. The BIOS checks each device in order to see if it is bootable by attempting to load the first sector (boot sector). If the sector cannot be read, the BIOS proceeds to the next device.
These choices can include different operating systems (for dual or multi-booting from different partitions or drives), different versions of the same operating system (in case a new version has unexpected problems), different operating system loading options (e.g., booting into a rescue or safe mode), and some standalone programs that can ...
In Safe Mode, the computer starts by using normal kernels, even if the /PAE switch is specified. [7] /PCILOCK – For x86-based systems, this stops the operating system from dynamically assigning hardware input, hardware output, and interrupt request resources to PCI devices. Instead, the BIOS configures the devices. [7]
EasyBCD has a number of bootloader-related features that can be used to repair and configure the bootloader. From the "Manage Bootloader" section of EasyBCD, it is possible to switch between the BOOTMGR bootloader (used since Windows Vista) and the NTLDR bootloader (used by legacy versions of Windows, from Windows NT to Windows XP) in the MBR from within Windows by simply clicking a button.
Furthermore, on a modern x86 system, BIOS calls can only be performed in Real mode, or Virtual 8086 mode. v8086 is not an option in Long mode. This means that a modern operating system, which operates in Protected mode (32 bit), or Long mode (64 bit), would need to switch into real mode and back to call the BIOS - a hugely expensive operation.
Some older systems have limited support for USB, since their BIOSes were not designed with such purpose at the time. Other devices may not be booted from USB, if in BIOS it is set to 'Legacy mode'Legacy mode. Due to the additional write cycles that occur on a full installation, the life span of the used USB may be shortened. [4]