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I'm trying to make a bootable USB drive for Ubuntu 12.04.1.

The USB drive created by unetbootin doesn't boot; it results in a Disk I/O error message.

In trying to create a bootable USB drive, PenDriveLinux installer reports a syntax error in syslinux and then says that the drive will not be bootable. And it isn't. It produces the same "Disk I/O error" message.

Is there some way around this or a fix for it?

Thank all of you for your help. The error I kept getting was this:

An error (1) occurred while executing syslinux. Your USB drive won't be bootable...

After googling around to find out what error (1) was, I moved from my crufty old XP machine to a newer, cleaner Windows 7 machine, and guess what? PendriveLinux created a bootable USB drive on the first try.

I am happy now. :-)

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closed as too localized by fossfreedom Sep 23 '12 at 20:34

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

which OS are you using? – green Sep 18 '12 at 11:28
It's possible that your USB might be defected?! – blade19899 Sep 18 '12 at 12:24

If you are using windows to create the usb stick, try marking the partition as active.
Here is how you do it. windows key and type diskpart and press enter.A command prompt opens.
2.Type list disk and press enter. the disk by using the command select disk "diskno"( without the quotes )where diskno is the appropriate disk number as seen in list disk. the appropriate partition by using list partition and select partition commands.
5.After selecting the partition type active to mark the partition active.

Then try making the usb stick.
If this doesn't help chek the MD5 sums of the iso you downloaded.

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Maybe try different Live USB creating soft:like this

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