This one’s for my fellow parents. If you’ve got some school-age kids, they’ve likely spent some time at a computer (yours or a friend’s), downloading from peer-to-peer (”P2P“) networks like the Gnutella network, which can be accessed via the popular LimeWire program.
According to our research, many of you want to know how to best use the program, without getting bit by a virus. Today, I’ll show you how.
Installation & Sharing
The company which makes LimeWire will tell you – this is very important – when you go to download the installation file, you should only do so from the program’s official site! Doing so makes absolutely sure that you have a legitimate version of the program, without the inclusion of any malicious code. Please don’t download from other sources, especially from other P2P networks.
When installing LimeWire for the first time, it’s a good idea to make sure that the program is set to not automatically share any downloaded files. Despite what is often said in the mainstream (read: non-tech-savvy) press, it has been sharing or distributing files, not downloading or receiving them, that has ended up with so many people being brought into court.
One caveat: That setting doesn’t apply to downloads through the BitTorrent network, which LimeWire also supports. In a BitTorrent network (or “swarm”), everyone downloading a file is simultaneously distributing it!
Search Filtering
Please, make sure “Search Filtering” is on. Click on the Tools menu near the top, then Options. After the Options screen appears, click on Search, then Configure under Search Filtering. Make sure that the settings are such that programs (executable files) are not included in the search results. Virus code spreads easiest in executable files, opened on accident by users who may not know better.
You may think you’re downloading a photograph, but go to open the file, named HotChick.jpg.exe, which ends up, as my teacher might say, barfing all over your system.
Scan Everything!
While your top threat is from executable program files, any file you download can be infected with some kind of code. Remember, you’re not necessarily getting these files from a clean server, you’re getting them from other users, who may be unknowingly infected by something. It’s of critical importance to, before doing anything else with a file, to scan it with an updated anti-virus program. This is especially true for those of you who have enabled program downloads anyway.
If you have an antivirus software installed, be sure to keep it updated. Consult the program’s documentation. If you don’t have an anti-virus installed, try the AVG Free Edition.
Once the download is complete, right-click the file listing in your Library, then select Locate on Disk. This will open up your file manager and highlight the file. Right-click on that file, and select the appropriate command to scan your file. Your anti-virus will report to you any infected files, and prompt you to delete said file.
When scouring P2P networks like LimeWire, it pays to play safe. A few preventative steps, plus some common sense, adds up to a safer experience.
If you have any important tips for potential downloaders, please feel free to sound off in our comments.
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How To Create An Ubuntu Installation USB On The Mac
Posted: 09 Aug 2009 07:01 AM PDT
I just let myself be lured into buying a Netbook for my daughter. It was a good deal actually and I love the machine. The only problem is that it came with no OS and no optical disc drive (it has two USB ports, though). The only option to get it up and running – without the need to buy (or borrow) an external optical drive – is to install the OS via a USB thumb drive.
Armed with my faithful MacBook, an internet connection, and a 2GB USB flash disk; I set out on an adventure to bring my daughter’s future netbook alive.
Deciding on the OS
It didn’t take long for me to decide to install Ubuntu on the netbook. Free would be the first reason and familiarity is the second. I’ve tried Ubuntu before and I have the installation CD with me.
As naive as it sounds, some people still think that you can just copy and paste the content of the CD to the USB drive and boot the machine with it. That’s why my first quest is to find out how to transfer the installation ability of the CD to USB – the Mac way of course.
The search ended up with an unexpectedly different result. I found something more interesting: there is a netbook version of Ubuntu called Ubuntu Netbook Remix (UNR for short) which is designed for the small screen and Intel Atom processor (as most netbooks are). The minimum requirement is 384MB of RAM.
So I choose the nearest download location for me and hit the “Begin Download” button.
Note: If you are wondering whether your netbook is compatible, you can check their list of tested and compatible models, but in general, it should work with most netbook models. Mine is not listed but I’ve discovered no problem so far.
Creating the USB installer
The Ubuntu site has a page describing how to create the USB installer. Basically, you have to get an .IMG version of the Ubuntu installer (UNR is already in IMG format), and then convert it to the USB drive.
Windows users have the luxury of an easy GUI way of converting the IMG with the help of Disk Imager . Ubuntu users has their own Ubuntu ImageWriter. But Mac users and other Linux users have to bear with the geeky command lines method.
The first thing to do to create the USB installer using Mac’s Terminal command line is to make the process easier by moving the UNR installer file to the highest position of the folder structure and then changing the name to something shorter like “unr.img” (sans quote). Don’t forget to make sure that there’s no USB drive plugged.
Then follow these steps:
- Type : diskutil list in the Terminal and hit Enter
- Plug in your USB flash disk and repeat step 1
- Compare the result and you’ll have the device node assigned to your flash media. Usually something like “/dev/disk2” (sans quote)
- Type : diskutil unmountDisk /dev/diskN in the Terminal and hit Enter. You’ll have to replace the /dev/diskN with the device node that you got from step 3. From the picture above you can see that the device node assigned for my USB flash drive is “/dev/disk1” (sans quote)
- Type : sudo dd if=/path/to/downloaded.img of=/dev/diskN bs=1m in the Terminal and hit Enter. But there are several things that you have to change here before you hit Enter:
- first the /path/to/downloaded.img is the location of the downloaded UNR installer file. As we’ve already taken care of this before, all you’ve got to do is to change the string into /unr.img
- second, the /dev/diskN is the device node which is the same as step 4
- and the last, if you see the error line: dd: Invalid number ‘1m’ then you need to change the bs=1m into bs=1M (notice the capital ‘M’) - Write your password, hit enter, and wait until the process is finished. Please be warned that all the data in the USB drive will be lost.
- Type : diskutil eject /dev/diskN in the Terminal and hit Enter.
- Unplug your USB drive.
Installing UNR in the Netbook
We now come to the climax of the story. I plug the USB drive into the Netbook’s USB port and start the machine. During the booting process, I press the F10 button to go into the booting option, choose to boot from the USB drive, and….the prince and princess live happily ever after.
Every manufacturer might have different settings for this booting menu, so please refer to your machine’s documentation. Another option is to look carefully at the bottom left part of the screen during the beginning of the booting process because usually the booting instructions are written there.
Now the netbook is alive and well, running UNR while my daughter has to continuously ‘compete’ with his father – yours truly – to use the tiny machine. 
As for me, I am now addicted to the concept of a USB Drive as the OS installation method and will surely try to find out more about it.
Have you tried UNR? Do you know any other method to create an installation USB drive for other OS’s? Share using the comments below.
Did you like the post? Please do share your thoughts in the comments section!
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