Set the U disk to start why not? Problems with the BIOS
1, USB-HDD
Hard drive simulation mode, DOS boot after the show C: disk, 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.
2, Usb-zip
Large-capacity floppy disk simulation mode, DOS boot after the display of a disk, Flashboot made Usb-zip launch disk that is used in 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.
3, usb-hdd+
Enhanced USB-HDD mode, DOS boot display c: Disk, compatibility is very high. The disadvantage is that computers that support only usb-zip cannot be started.
4, usb-zip+
Enhanced Usb-zip mode, support for Usb-hdd/usb-zip dual-mode boot (depending on the computer, some BIOS may display a C: Disk after DOS boot, some BIOS may display a: Disk after DOS startup, thus achieving 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.
5, Usb-cdrom
CD-ROM emulation mode, DOS boot can not be used as a placeholder, compatibility general. The advantage is that it can be xp/2003 installed like a CD-ROM. The general need for the production of a specific U disk model/batch of the corresponding production tools to produce, for the U3 disk Network has a general production tools.