Large collection of USB boot modes

Do you know the difference between the various U disk startup modes, the following for you to talk about this knowledge:

Various USB boot modes:

1, USB-HDD: (occupy 1 sectors) hard drive emulation mode, after DOS boot display c: disk, hp (HP) u disk Format tool made by the USB flash drive that is used in this boot mode. This mode is highly compatible, but it cannot be started for some computers that only support Usb-zip mode.

When the computer starts, it reads the MBR first, and then starts from the specified active primary partition (so that the partition you want to boot must be active, and there is a specified boot file), read into the PBR boot sector, and then boot-sector-specific boot file to boot the system or PE or GRLDR ....

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

2, Usb-hdd+: (occupy 1 sectors) Enhanced USB-HDD mode, after DOS boot display c: Disk, compatibility is very high. The disadvantage is that computers that support Usb-zip only fail to boot.

When the computer starts, it reads 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 to start the system or PE or GRLDR ....

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

3, Usb-zip: Large capacity floppy disk emulation mode, DOS boot display a disk, flashboot production of usb-zip startup USB flash drive that use this mode. This mode is the only optional mode on some older computers, but it is not good for most new computers, especially the high-capacity U disk.

The boot process is: partition pbr→ boot file

4, 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 the C: Disk after DOS boot, some BIOS may display a after DOS boot), Thus achieving very high compatibility. The disadvantage is that some support USB-HDD computer will be the mode of the USB drive is considered to be usb-zip to start, resulting in more than 4GB of high-capacity U disk compatibility has been reduced.

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

5. USB-FDD: Refers to the USB drive to simulate the floppy drive mode, the drive after the start of the disk letter is a:,

The boot process is: partition pbr→ boot file

6, Usb-cdrom: Disc emulation mode, DOS boot can not account for the disk, compatibility is high, new and old motherboards are generally available. Advantages can be used like a disc (for example, for Windows System installation). Shortcomings, the volume of the U disk production into this mode, we will lose the memory of this part of the disk space write rights, the remaining space will be recognized as a separate U disk, can be removable disk, of course, can also be made of fixed disk, further zoning. Production generally need specific U disk model/lot number corresponding to the production tools to make, for the U disk Online has the corresponding production tools.