The main function of GRUB is placed in a single file grldr, while the boot loader is placed in another file grldr. At startup, boot code in grldr. Using this scheme, the location of boot file is no longer fixed, users can move it across partition boundary without causing booting problems. The other is grub. The most significant enhancement is the map command. These virtual devices can be accessed even after DOS starts.
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The main function of GRUB is placed in a single file grldr, while the boot loader is placed in another file grldr. At startup, boot code in grldr. Using this scheme, the location of boot file is no longer fixed, users can move it across partition boundary without causing booting problems.
The other is grub. The most significant enhancement is the map command. These virtual devices can be accessed even after DOS starts. Some of them require modifying MBR or partition boot sector, while others require changing system startup configuration files.
There are many options you can use with bootlace and grubinst, use the -h option to display help message. After installing the boot code, you need to copy grldr and menu. Then copy grldr. Note: previous version of grldr. But it doesn't work anymore with the latest version. The virtual disk is implemented using INT In indirect mapping, the image file is copy to memory before the mapping is applies, therefore, the image file need not to be contiguous, however, you must have enough memory to hole the image file.
To create virtual hard disk, you need an image file that resemble a real hard disk, which consist of MBR and partition data. If the image file only contains partition data, you need to patch it with MBR to create disk image. When mapping disk image file, it will test the presence of MBR, if not found, it will create MBR automatically using the partition data.
For example:. In fact, the following two menu entries do roughly the same thing:. This device is always accessible. However, if you want to access file from other CDROMs, you still need to initialize them using the above commands.
The first one tells BIOS to load the whole grldr. However, some buggy BIOS might ignore it and load only a portion of the file, typically one sector bytes.
This will cause the program to fail. This method is safer, it should work for most BIOS. Note: you can optionally use the -boot-info-table option, but the info table will be ignored by the program. Grub4dos tutorial From Grub4Dos Wiki. Jump to: navigation , search. Views Article Discussion Edit History. Contents 1 Introduction 1.
Grub4dos Guide - Experimenting with Grub4dos
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To test installing and using Grub4dos without risking any damage to your current operating system, use a Virtual Machine. With the widespread availability of hardware virtualising software, it's a relatively straightforward process to create a hard disk image for testing. For those comfortable with command line tools, QEMU is a freeware machine emulator ported to Windows. QEMU does not need to be installed and can be used as a portable application - simply unzip the contents of the download to a location of your choice and run from a command prompt.