Create a CentOS bootable USB flash drive system larger than 4G

I. Requirements

Server needs to install operating system

no optical drive, no external optical drive, Requires a USB flash drive to install the CentOS 7-x86_64 operating system

Make a CentOS boot image. For the FAT32 file system , its disadvantage cannot store more than 4G of files ,

For the NTFS file system, there is no such restriction, so windos can choose NTFS format to make a USB stick.

However, the Linux system does not recognize the NTFS file system.

Two. Solution

1. Compact CentOS image reduction?

Full version of the image is larger than 4G, that can be reduced to some unnecessary RPM installation package?

Result: Failed. When installing the system, check that the installation image is modified and cannot proceed to the next installation.

Rethink: No matter what file you delete, it fails. Can I bypass the check?

2.pq+ext2fsd+ultraiso?

UltraISO writing to the CentOS boot image

PQ divides the USB drive into two zones, one FAT32 boot, and one EXT2FSD to store the CentOS system image

Result: Failed. The idea is beautiful, the result of the last partition failed, prompt IO Error! Maybe it's the reason for my USB drive, no further research.

3. Soft disc to burn the U disk (the entire image is written directly to the USB flash drive, no need to duplicate an image)

When the initial boot interface is installed, press the table key,

Will vmlinuz initrd=initrd.img inst.stage2=HD:label=centos\x207\x20x86_64 Rd.live.check Quiet modified to: Vmlinuz initrd=initrd.img linux dd quiet after the return, will be listed your device list

you need to see what your own is.Enter C here can be directly into the system installation interface without shutting down the machinerepeat the 2nd step and change the command below to: Vmlinuz initrd=initrd.img INST.STAGE2=HD:/dev/ SDC4   quie

sdc4 You have to change the name of your own USB stick. , and then enter. If you are not wrong, you should come to the language selection interface, and then the graphical setup interface.

PS: If the black screen after carriage return, it is because the notebook brightness is insufficient ... Brighten to see text

Result: Success

4. For ISO greater than 4G, you can format the USB drive in ext3 format and write it to the Ext tool to write

Result: no attempt

Three. Impressions

1. Although the information on the Internet has, can be too much information, so a small problem has been tossing a half day.

Search for information, the ability to identify information needs to be improved, can not be trusted by others tutorial, specific analysis.

2. When thinking about the problem into the thinking of the misunderstanding, that the installation image is larger than 4g can not be copied into the FAT file system, should also be unable to write mass production ... Turns out to be a big circle.

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Create a CentOS bootable USB flash drive system larger than 4G