Learn about USB disk startup mode

In the production of U disk Startup disk, we will be exposed to the starting mode of the related issues, what are the different modes? Now for you to analyze:

First, usb-hdd+: (occupy 1 sectors) Enhanced USB-HDD mode, DOS boot after the display of C: Disk, compatibility is very high. The disadvantage is that computers that support only usb-zip cannot be started.

The computer starts reading the MBR first, then starts from the specified active primary partition, reads into the PBR boot sector, and then the boot file specified by the boot sector, starting the system or PE or GRLDR ....

The boot process is: mbr→ partition pbr→ boot file

Second, USB-HDD: (occupy 1 sectors) hard drive simulation mode, DOS boot after the show C: disk, hp (HP) u disk Format tool made by the U disk is the starting mode. This mode is highly compatible, but cannot be started for some computers that only support Usb-zip mode.

This MBR is read first after the computer starts, it is then started from the specified active primary partition (so the partition you want to start must be activated and the specified boot file exists), read into the PBR boot sector, and then boot to the boot sector, starting the system or PE or GRLDR ....

The common boot process is: mbr→ partition pbr→ boot files (such as: XP Ntldr,vista bootmgr, Grub GRLDR. )

Third, Usb-zip: large-capacity floppy disk simulation mode, DOS boot after the display of a disk, Flashboot made the usb-zip to start the U disk is to use this mode. This mode is the only optional mode on some older computers, but it is not compatible with most new PCs, especially the large capacity U disk.

The boot process is: partition pbr→ boot files

Four, usb-zip+:: (occupy 1 sectors) Enhanced Usb-zip mode, support Usb-hdd/usb-zip dual-mode boot (depending on the computer, some BIOS may display after DOS boot c: disk, some bios in the DOS boot may show a: disk), So as to achieve high compatibility. The disadvantage is that some support USB-HDD computer will be this mode of the U disk is usb-zip to start, resulting in more than 4GB of large capacity U disk compatibility has been reduced.

The boot process is: mbr→ partition pbr→ boot file

Five, USB-FDD: Refers to the U disk simulation into a floppy drive mode, after the launch of the U disk is a:,

The boot process is: partition pbr→ boot files

VI, USB-CDROM: CD simulation mode, DOS boot can not occupy the letter, compatibility is high, the new and old motherboard can be generally. Advantages can be used like a CD-ROM (for example, for a Windows system installation). Disadvantages, the volume of U disk production into this mode, we will lose this part of U disk space to write right, the remaining space will be recognized as a stand-alone U disk, can be removable disk, of course, can also be made into a fixed disk, further zoning. When making the general need for specific U disk model/batch number of the corresponding production tools to make, for U disk Online has the corresponding mass production tools.

Seven. NT 5.x: (occupies 1 sectors) This MBR is still started from the active primary partition, and the partition table error is reported when multiple activation partitions are encountered.

The boot process is: mbr→ partition pbr→ boot file

Eight, NT 6.x: (occupies 1 sectors) This MBR is still booting from the active primary partition, enabling multiple activation partitions, starting from the first active partition.

The boot process is: mbr→ partition pbr→ boot file

Ix. PLoP Boot Manager (occupies 62 sectors) * Supports USB disk boot, either from USB media or to boot to USB media (regardless of whether the BIOS supports USB boot). From the development log, the EHCI/OHCI/UHCI three interfaces are supported, but the external USB HUB is not supported. This function, indeed exciting, although the previous look Filo inside a USB stack, is protected mode, and this is in real mode. * Support CD Boot This is a two-tier meaning: can be started from the CD, but also from other media boot to the CD drive boot. * Ultra-small size and the support of the graphical interface, only 40-50kb, but can implement USB stack, and CDROM mini drive is indeed a miracle, but it also includes graphics support and launch effects.

X. Fbinst: (occupies 64 sectors) Fbinst writes the boot code in each sector of the MBR (the first 64 sectors). And in each sector to record the sector area code, so no matter how the U disk is recognized as a format, can start normally, the start of the need to read the 1~64 sector in the calculation of good information, The computer can quickly and correctly obtain the parameter, thus guides the UD area the GRLDR, causes the computer to start normally ...

The boot process is: Mbr→ud area → Boot file

Xi. grub4dos: (occupies 18 sectors, the old version occupies 16 sectors) is a powerful bootstrapper, can be installed in the MBR, can also be installed in the partition PBR, if installed in the MBR, you can search all partitions, start its designated file-grldr (no need to read into the partition PBR), Thus starting normally.

The boot process is: Mbr→grldr