How to Create a USB flash drive using ultraiso to start Ubuntu 8.10 livecd without changing the read/write speed of the USB flash drive

I. Principle of starting a USB flash drive using ultraiso

1. ultraiso 9.2 and later versions with the production of U + boot function, that is, USB-ZIP + or USB-HDD + boot function, compared with the past USB-ZIP and USB-HDD boot with stronger compatibility.

2. Using ultraiso to directly write ISO into a USB flash drive can enable the ISO boot system, including Ubuntu 8.10.
Livecd. In this way, you do not need to burn the disc, start livecd and then run Ubuntu
8.10 installation. However, the biggest disadvantage of this method is that it will greatly reduce the read/write speed of the USB flash disk, because the ISO partition format and cluster size are used to write data to the USB flash disk, affecting the performance of the USB flash disk. Especially for quality
After a good high-speed USB flash drive is written into ISO, the speed is usually only half of the original speed, which outweighs the loss. What's more, the USB flash drive has other functions.

3. Use ultraiso for portable writing
MBR function, which does not change the USB flash disk
Original format, write USB-ZIP + or USB-HDD + in MBR, so that the realization of the U disk boot, and will not change the U disk read and write speed. However, this method is more difficult to write directly.
Manually create a boot sector to start. There are two common methods to start the Boot Sector: syslinux
And grub4dos. Many people say that syslinux has strong startup compatibility, but there is a problem with IMG image boot on some laptops, so I recommend dos + grub4dos to you.
The guiding method.

4. advantages of using a USB flash drive to boot Ubuntu 8.10 livecd with DOS + grub4dos:
1) Using ultraiso portable writing MBR for USB-ZIP +, can be started on a computer supporting USB-ZIP or USB-HDD, strong compatibility.
2) use ultraiso to write data to the DOS Boot Sector in a portable manner, providing better support for the motherboard boot than syslinux. Start dos and then dos calls grub.
3) use the grub4dos method to start Ubuntu 8.10 livecd. You can also edit menu. lst and add the DOS system maintenance toolbox and PE to make one disk in hand, which is convenient to maintain the computer.

Ii. Use ultraiso to boot dos + grub4dos

1. Start ultraiso, choose boot CD/Write hard disk image from the menu, and select portable boot/write new Hard Disk Master Boot Record (MBR)/USB-ZIP + in the dialog box ".

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2. Select portable boot/write new Drive boot records/Windows 9X ".

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3. uncompress the attachment grub4dos.zipfiles, and then copy the dosboot file command.comw.io.sys?msdos.sysand grub.exe, menu. lst, and autoexec. bat to the USB flash drive root directory.
The startup sequence is: start dos, then start grub, and then start Ubuntu 8.10 livecd.
The method for starting livecd in menu. lst is the same as that for starting livecd on a general hard disk. The command is as follows:

Title Ubuntu 8.10 livecd
Find-set-root/Ubuntu/vmlinuz
Kernel/Ubuntu/vmlinuz boot = Casper
Iso-Scan/filename =/Ubuntu/ubuntu-8.10-desktop-i386.iso quiet splash RW
Persistent Debian-installer/locale = zh_CN.UTF-8
Console-Setup/layoutcode = cn console-Setup/variantcode =-
Initrd/Ubuntu/initrd.gz
Boot

4. Create an Ubuntu directory in the root directory of the USB flash drive.
5. Copy the downloaded ubuntu-8.10-desktop-i386.iso to the directory.
6. Use winraror other decompressed tools to open the isofiles. decompress the vmlinuz、initrd.gz file under the casperdirectory to the Ubuntu directory.
7, restart the computer, In the BIOS set USB-ZIP or USB-HDD boot, or when the boot menu in the boot select U disk, you can start Ubuntu 8.10 livecd.

Iii. How to enable other USB flash drives

If you are interested, you can edit menu. lst and add the DOS system maintenance toolbox and PE, provided that you have copied the relevant files to the corresponding directory of the USB flash drive.
1. The code for starting PE is:
Title old peach integrated Red Leaf PE (supporting https)
Find-set-root/boot/ntldr
Chainloader/boot/ntldr (hd0) + 1

2. The code for starting the dostoolbox is:
Title super ambulance 07.07.07 (diskgen2.0)
Find-set-root/boot/IMGs/dostools. img
Map-MEM/boot/IMGs/dostools. IMG (fd0)
Map (fd0) (fd1)
Map-Floppies = 2
Map-hook
Chainloader (fd0) + 1
Rootnoverify (fd0)
Boot

4. Make a saved liveusb

Ubuntu 8.10 liveusb can implement all the functions of livecd, and the system configuration changes are saved after restart.

In other words, UBUNTU 8.10 liveusb can achieve the same effect as Ubuntu installation without installing ubuntu.

However, liveusb cannot replace normal system installation. It is more stable than other installation methods. It can only be used temporarily to experience Ubuntu and demonstrate the role of ubuntu.

Therefore, liveusb can be used as a mobile operating system and is suitable for system maintenance personnel.

Make liveusb need to extract most of the ubuntu-8.10-desktop-i386.iso files out, it is recommended that U disk as long as the liveusb, remove livecd, that is to delete the original ISO file.

For details about how to create it, refer to "How to make Ubuntu 8.10 liveusb (save and modify it) and add the dostoolbox and PE Guide"
Http://forum.ubuntu.org.cn/viewtopic.php? F = 103 & t = 172013
Sixth big point "self-made Ubuntu 8.10 liveusb"

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File notes: Six files in the root directory of the U Disk: command.comw.io.sys?msdos.sys=grub.exe, menu. lst, autoexec. bat Grub4dos.zip [307.65 kib]