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First, we create 2 partitions on the USB stick that is let's say 16GB.

first partition is let's say only 1GB
and the second partition is the rest of what is available.

after we "w" write the changes, the USB now has 2 partitions.

  • 1 is 1GB
  • 1 is more than 14GB

so , we have... sdb1 and sdb2 now.

now we need to turn these partitions into filesystems some say i should run these commands after those procedures.

mkfs.vfat -F 32 /dev/sdb1
mkfs.ext3 /dev/sdb2

but some web pages recommend using:

mkfs.vfat -n BOOT /dev/sdb1
mkfs.ext2 -m 0 -b 4096 -L DATA /dev/sdb2

which is it?

so let's say the DVDs are called:

  • CentOS-6.4-x86_64-bin-DVD1.iso
  • CentOS-6.4-x86_64-bin-DVD2.iso

so we make a directory:

mkdir -p /mnt/dvd1

and then mount it:

mount -o loop CentOS-6.4-x86_64-bin-DVD1.iso /mnt/dvd1

and i suppose we don't make a directory for dvd2 and we don't have to mount it ?

at this point i do not know what should be done.

but i think this step might be next:

we make the USB bootable by finding the file named mbr.bin and then moving it to there via these commnad.

dd conv=notrunc bs=440 count=1 if=/usr/lib/syslinux/mbr.bin of=/dev/sdb
parted /dev/sdb set 1 boot on

in other words we are "dd-ing it to 'sdb' not sdb1' or 'sdb2'. and then we use parted to set the boot to on for sdb

so far everything looks good?

here is the confusing parts..

how exactly do i move these iso files to the usb drive?

EVERYTHING BELOW IS A GUESS.

so at this point i should

  • copy the folder /mnt/dvd1/isolinux to usb's sdb1 or sdb2 ?
  • rename it to syslinux ?
  • and then inside this syslinux folder there will be a file called...
  • isolinux.cfg ?
  • which should be renamed to syslinux.cfg ?

  • and then copy the contents of /mnt/dvd1/images/* to USB's sdb2 ?

but i think i am also suppose to copy and paste the both

  • CentOS-6.4-x86_64-bin-DVD1.iso
  • CentOS-6.4-x86_64-bin-DVD2.iso

somewhere into this USB's sdb2 partition, correct ? almost like a drag and drop kind of a thing?

or do they go into any folders ?

centos' own web site has some instructions but those instructions do not work.

http://wiki.centos.org/HowTos/InstallFromUSBkey

i once got this working but things got ruined, i have to do it again and this time take notes.

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2 Answers 2

Use Unetbootin. That automates all that hard to remember stuff for you.

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Unetbootin does not seem to be working with centos as well as fedora, i just tried it multiple times , installation shows up but it fails, only worked for linux mint 14 –  user250563 Sep 2 '13 at 8:51

unetbootin creates an initrd that you need to mount somehow to get your own stuff on.

In other words, if you want to e.g. do a bios update, unetbootin is useless.

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